MineLittlePony/src/main/java/com/minelittlepony/client/model/AbstractPonyModel.java

package com.minelittlepony.client.model;

import com.minelittlepony.client.model.armour.ModelPonyArmour;
import com.minelittlepony.client.model.armour.ArmourWrapper;
import com.minelittlepony.client.model.components.PonySnout;
import com.minelittlepony.client.model.components.PonyTail;
import com.minelittlepony.client.transform.PonyTransformation;
import com.minelittlepony.client.util.render.AbstractRenderer;
import com.minelittlepony.client.util.render.PonyRenderer;
import com.minelittlepony.client.util.render.plane.PlaneRenderer;
import com.minelittlepony.model.BodyPart;
import com.minelittlepony.model.IPart;
import com.minelittlepony.model.armour.IEquestrianArmour;

import net.minecraft.client.model.Cuboid;
import net.minecraft.entity.Entity;
import net.minecraft.entity.LivingEntity;
import net.minecraft.util.AbsoluteHand;
import net.minecraft.util.math.MathHelper;

import java.util.function.Consumer;

import static com.mojang.blaze3d.platform.GlStateManager.*;

/**
 * Foundation class for all types of ponies.
 */
public abstract class AbstractPonyModel<T extends LivingEntity> extends ClientPonyModel<T> {

    protected PlaneRenderer upperTorso;
    protected PlaneRenderer neck;

    protected IPart tail;
    protected PonySnout snout;

    public AbstractPonyModel(boolean arms) {
        super(0, arms);
    }

    @Override
    public IEquestrianArmour<?> createArmour() {
        return new ArmourWrapper<>(new ModelPonyArmour<>(), new ModelPonyArmour<>());
    }

    /**
     * Sets the model's various rotation angles.
     *
     * @param move      Entity motion parameter
     *                  i.e. velocity in no specific direction used in bipeds to calculate step amount.
     * @param swing     Degree to which each 'limb' swings.
     * @param ticks     Total whole and partial ticks since the entity's existence.
     *                  Used in animations together with {@code swing} and {@code move}.
     * @param headYaw   Horizontal head motion in radians.
     * @param headPitch Vertical head motion in radians.
     * @param scale     Scaling factor used to render this model.
     *                  Determined by the return value of {@link RenderLivingBase.prepareScale}.
     *                  Usually {@code 0.0625F}.
     * @param entity    The entity we're being called for.
     */
    @Override
    public void setAngles(T entity, float move, float swing, float ticks, float headYaw, float headPitch, float scale) {
        attributes.checkRainboom(entity, swing, canFly());

        super.setAngles(entity, move, swing, ticks, headYaw, headPitch, scale);

        updateHeadRotation(headYaw, headPitch);
        shakeBody(move, swing, getWobbleAmount(), ticks);
        rotateLegs(move, swing, ticks, entity);

        if (!attributes.isSwimming && !attributes.isGoingFast) {
            holdItem(swing);
        }
        swingItem(entity);

        if (attributes.isCrouching) {
            ponyCrouch();
        } else if (isRiding) {
            ponyRide();
        } else {
            adjustBody(BODY_ROT_X_NOTSNEAK, BODY_RP_Y_NOTSNEAK, BODY_RP_Z_NOTSNEAK);

            rightLeg.rotationPointY = FRONT_LEG_RP_Y_NOTSNEAK;
            leftLeg.rotationPointY = FRONT_LEG_RP_Y_NOTSNEAK;

            if (!attributes.isSleeping) {
                animateBreathing(ticks);
            }

            if (attributes.isSwimming) {
                head.setRotationPoint(0, -2, -2);
            } else {
                head.setRotationPoint(0, 0, 0);
            }
        }

        if (attributes.isSleeping) {
            ponySleep();
        }

        animateWears();

        snout.setGender(getMetadata().getGender());
    }

    /**
     * Aligns legs to a sneaky position.
     */
    protected void ponyCrouch() {
        adjustBody(BODY_ROT_X_SNEAK, BODY_RP_Y_SNEAK, BODY_RP_Z_SNEAK);
        head.setRotationPoint(0, 6, -2);

        rightArm.pitch -= LEG_ROT_X_SNEAK_ADJ;
        leftArm.pitch -= LEG_ROT_X_SNEAK_ADJ;

        leftLeg.rotationPointY = FRONT_LEG_RP_Y_SNEAK;
        rightLeg.rotationPointY = FRONT_LEG_RP_Y_SNEAK;
    }

    protected void ponySleep() {
        rightArm.pitch = ROTATE_270;
        leftArm.pitch = ROTATE_270;

        rightLeg.pitch = ROTATE_90;
        leftLeg.pitch = ROTATE_90;

        head.setRotationPoint(1, 2, isSneaking ? -1 : 1);

        AbstractRenderer.shiftRotationPoint(rightArm, 0, 2,  6);
        AbstractRenderer.shiftRotationPoint(leftArm,  0, 2,  6);
        AbstractRenderer.shiftRotationPoint(rightLeg, 0, 2, -8);
        AbstractRenderer.shiftRotationPoint(leftLeg,  0, 2, -8);
    }

    protected void ponyRide() {
        if (attributes.isSitting) {
            adjustBodyComponents(BODY_ROT_X_RIDING * 2, BODY_RP_Y_RIDING, BODY_RP_Z_RIDING);
            adjustNeck(BODY_ROT_X_NOTSNEAK * 2, BODY_RP_Y_NOTSNEAK, BODY_RP_Z_NOTSNEAK - 4);
            head.setRotationPoint(0, -2, -5);
        } else {
            adjustBodyComponents(BODY_ROT_X_RIDING, BODY_RP_Y_RIDING, BODY_RP_Z_RIDING);
            adjustNeck(BODY_ROT_X_NOTSNEAK, BODY_RP_Y_NOTSNEAK, BODY_RP_Z_NOTSNEAK);
            head.setRotationPoint(0, 0, 0);
        }

        leftLeg.rotationPointZ = 15;
        leftLeg.rotationPointY = 9;
        leftLeg.pitch = -PI / 4;
        leftLeg.yaw = -PI / 5;

        rightLeg.rotationPointZ = 15;
        rightLeg.rotationPointY = 9;
        rightLeg.pitch = -PI / 4;
        rightLeg.yaw =  PI / 5;

        leftArm.roll = -PI * 0.06f;
        rightArm.roll = PI * 0.06f;

        if (attributes.isSitting) {
            leftLeg.yaw = PI / 15;
            leftLeg.pitch = PI / 9;

            leftLeg.rotationPointZ = 10;
            leftLeg.rotationPointY = 7;

            rightLeg.yaw = -PI / 15;
            rightLeg.pitch = PI / 9;

            rightLeg.rotationPointZ = 10;
            rightLeg.rotationPointY = 7;

            leftArm.pitch = PI / 6;
            rightArm.pitch = PI / 6;

            leftArm.roll *= 2;
            rightArm.roll *= 2;
        }
    }

    /**
     * Sets the model's various rotation angles.
     *
     * @param move      Entity motion parameter - i.e. velocity in no specific direction used in bipeds to calculate step amount.
     * @param swing     Degree to which each 'limb' swings.
     * @param bodySwing Horizontal (Y) body rotation.
     * @param ticks       Total whole and partial ticks since the entity's existance. Used in animations together with {@code swing} and {@code move}.
     */
    protected void shakeBody(float move, float swing, float bodySwing, float ticks) {
        tail.setRotationAndAngles(attributes.isSwimming || attributes.isGoingFast, attributes.interpolatorId, move, swing, bodySwing * 5, ticks);

        upperTorso.yaw = bodySwing;
        body.yaw = bodySwing;
        neck.yaw = bodySwing;
    }

    private void animateWears() {
        leftArmOverlay.copyRotation(leftArm);
        rightArmOverlay.copyRotation(rightArm);
        leftLegOverlay.copyRotation(leftLeg);
        rightLegOverlay.copyRotation(rightLeg);
        bodyOverlay.copyRotation(body);
        headwear.copyRotation(head);
    }

    /**
     * Called to update the head rotation.
     *
     * @param x     New rotation X
     * @param y     New rotation Y
     */
    private void updateHeadRotation(float headYaw, float headPitch) {

        head.yaw = attributes.isSleeping ? (Math.abs(attributes.interpolatorId.getMostSignificantBits()) % 2.8F) - 1.9F : headYaw / 57.29578F;

        headPitch = attributes.isSleeping ? 0.1f : headPitch / 57.29578F;

        if (attributes.isSwimming) {
            headPitch -= 0.9F;
        }

        float pitch = (float)Math.toRadians(attributes.motionPitch);

        head.pitch = MathHelper.clamp(headPitch, -1.25f - pitch, 0.5f - pitch);
    }

    /**
    *
    * Used to set the legs rotation based on walking/crouching animations.
    *
    * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
    *
    */
    protected void rotateLegs(float move, float swing, float ticks, T entity) {
        if (attributes.isSwimming) {
            rotateLegsSwimming(move, swing, ticks, entity);
        } else if (attributes.isGoingFast) {
            rotateLegsInFlight(move, swing, ticks, entity);
        } else {
            rotateLegsOnGround(move, swing, ticks, entity);
        }

        float sin = MathHelper.sin(body.yaw) * 5;
        float cos = MathHelper.cos(body.yaw) * 5;

        float spread = attributes.isGoingFast ? 2 : 1;

        rightArm.rotationPointZ = spread + sin;
        leftArm.rotationPointZ = spread - sin;

        float legRPX = cos - getLegOutset() - 0.001F;

        legRPX = getMetadata().getInterpolator(attributes.interpolatorId).interpolate("legOffset", legRPX, 3);

        rightArm.rotationPointX = -legRPX;
        rightLeg.rotationPointX = -legRPX;

        leftArm.rotationPointX = legRPX;
        leftLeg.rotationPointX = legRPX;

        rightArm.yaw += body.yaw;
        leftArm.yaw += body.yaw;

        rightArm.rotationPointY = leftArm.rotationPointY = 8;
        rightLeg.rotationPointZ = leftLeg.rotationPointZ = 10;
    }

    /**
     * Rotates legs in a quopy fashion whilst swimming.
     *
     * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
     */
    protected void rotateLegsSwimming(float move, float swing, float ticks, T entity) {

        float lerp = entity.isSwimming() ? (float)attributes.motionLerp : 1;

        float legLeft = (ROTATE_90 + MathHelper.sin((move / 3) + 2 * PI/3) / 2) * lerp;

        float left = (ROTATE_90 + MathHelper.sin((move / 3) + 2 * PI) / 2) * lerp;
        float right = (ROTATE_90 + MathHelper.sin(move / 3) / 2) * lerp;

        leftArm.pitch = -left;
        leftArm.yaw = -left/2;
        leftArm.roll = left/2;

        rightArm.pitch = -right;
        rightArm.yaw = right/2;
        rightArm.roll = -right/2;

        leftLeg.pitch = legLeft;
        rightLeg.pitch = right;

        leftLeg.yaw = 0;
        rightLeg.yaw = 0;
    }

    /**
     * Rotates legs in quopy fashion whilst flying.
     *
     * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
     *
     */
    protected void rotateLegsInFlight(float move, float swing, float ticks, Entity entity) {
        float armX = attributes.isGoingFast ? ROTATE_270 : MathHelper.sin(-swing / 2);
        float legX = attributes.isGoingFast ? ROTATE_90 : MathHelper.sin(swing / 2);

        leftArm.pitch = armX;
        rightArm.pitch = armX;

        leftLeg.pitch = legX;
        rightLeg.pitch = legX;

        leftArm.yaw = -0.2F;
        leftLeg.yaw = 0.2F;

        rightArm.yaw = 0.2F;
        rightLeg.yaw = -0.2F;

        rightArm.roll = 0;
        leftArm.roll = 0;
    }

    /**
     * Rotates legs in quopy fashion for walking.
     *
     * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
     *
     */
    protected void rotateLegsOnGround(float move, float swing, float ticks, T entity) {
        float angle = PI * (float) Math.pow(swing, 16);

        float baseRotation = move * 0.6662F; // magic number ahoy
        float scale = swing / 4;

        leftArm.pitch =  MathHelper.cos(baseRotation + angle) * scale;
        rightArm.pitch = MathHelper.cos(baseRotation + PI + angle / 2) * scale;

        leftLeg.pitch =  MathHelper.cos(baseRotation + PI - (angle * 0.4f)) * scale;
        rightLeg.pitch = MathHelper.cos(baseRotation + angle / 5) * scale;

        leftArm.yaw = 0;
        rightArm.yaw = 0;

        leftLeg.yaw = 0;
        rightLeg.yaw = 0;

        rightArm.roll = 0;
        leftArm.roll = 0;
    }

    protected float getLegOutset() {
        if (attributes.isSleeping) {
            return 3.6f;
        }

        if (attributes.isCrouching) {
            return 1;
        }

        return 5;
    }

    /**
     * Adjusts legs as if holding an item. Delegates to the correct arm/leg/limb as necessary.
     */
    protected void holdItem(float swing) {
        boolean both = leftArmPose == ArmPose.ITEM && rightArmPose == ArmPose.ITEM;

        alignArmForAction(leftArm, leftArmPose, rightArmPose, both, swing, 1);
        alignArmForAction(rightArm, rightArmPose, leftArmPose, both, swing, -1);
    }

    @Override
    public Cuboid getBodyPart(BodyPart part) {
        switch (part) {
            default:
            case HEAD: return head;
            case NECK: return neck;
            case TAIL:
            case LEGS:
            case BODY: return body;
        }
    }

    /**
     * Aligns an arm for the appropriate arm pose
     *
     * @param arm   The arm model to align
     * @param pose  The post to align to
     * @param both  True if we have something in both hands
     * @param swing     Degree to which each 'limb' swings.
     */
    protected void alignArmForAction(Cuboid arm, ArmPose pose, ArmPose complement, boolean both, float swing, float reflect) {
        switch (pose) {
            case ITEM:
                arm.yaw = 0;

                if ((!both || reflect == (attributes.isLeftHanded ? 1 : -1)) && complement != ArmPose.BLOCK) {
                    float swag = 1;
                    if (!isFlying() && both) {
                        swag -= (float)Math.pow(swing, 2);
                    }

                    float mult = 1 - swag/2;
                    arm.pitch = arm.pitch * mult - (PI / 10) * swag;
                    arm.roll = -reflect * (PI / 15);

                    if (attributes.isCrouching) {
                        arm.rotationPointX -= reflect * 2;
                    }
                }

                break;
            case EMPTY:
                arm.yaw = 0;
                break;
            case BLOCK:
                arm.pitch = (arm.pitch / 2 - 0.9424779F) - 0.3F;
                arm.yaw = reflect * PI / 9;
                if (complement == pose) {
                    arm.yaw -= reflect * PI / 18;
                }
                arm.rotationPointX += reflect;
                arm.rotationPointZ += 3;
                if (attributes.isCrouching) {
                    arm.rotationPointY += 4;
                }
                break;
            case BOW_AND_ARROW:
                aimBow(arm, swing);
                break;
            case CROSSBOW_HOLD:
                aimBow(arm, swing);

                arm.pitch = head.pitch - ROTATE_90;
                arm.yaw = head.yaw + 0.06F;
                break;
            case CROSSBOW_CHARGE:
                aimBow(arm, swing);

                arm.pitch = -0.8F;
                arm.yaw = head.yaw + 0.06F;
                break;
            case THROW_SPEAR:
                arm.pitch = ROTATE_90 * 2;
                break;
        }
    }

    protected void aimBow(Cuboid arm, float ticks) {
        arm.pitch = ROTATE_270 + head.pitch + (MathHelper.sin(ticks * 0.067F) * 0.05F);
        arm.yaw = head.yaw - 0.06F;
        arm.roll = MathHelper.cos(ticks * 0.09F) * 0.05F + 0.05F;

        if (isSneaking) {
            arm.rotationPointY += 4;
        }
    }

    /**
     * Animates arm swinging. Delegates to the correct arm/leg/limb as neccessary.
     *
     * @param entity     The entity we are being called for.
     */
    protected void swingItem(T entity) {
        if (getSwingAmount() > 0 && !attributes.isSleeping) {
            AbsoluteHand mainSide = getPreferedHand(entity);

            swingArm(getArm(mainSide));
        }
    }

    /**
     * Animates arm swinging.
     *
     * @param arm       The arm to swing
     */
    protected void swingArm(Cuboid arm) {
        float swing = 1 - (float)Math.pow(1 - getSwingAmount(), 3);

        float deltaX = MathHelper.sin(swing * PI);
        float deltaZ = MathHelper.sin(getSwingAmount() * PI);

        float deltaAim = deltaZ * (0.7F - head.pitch) * 0.75F;

        arm.pitch -= deltaAim + deltaX * 1.2F;
        arm.yaw += body.yaw * 2;
        arm.roll = -deltaZ * 0.4F;
    }

    /**
     * Animates the arm's breathing animation when holding items.
     *
     * @param ticks       Total whole and partial ticks since the entity's existence.
     *                    Used in animations together with {@code swing} and {@code move}.
     */
    protected void animateBreathing(float ticks) {
        float cos = MathHelper.cos(ticks * 0.09F) * 0.05F + 0.05F;
        float sin = MathHelper.sin(ticks * 0.067F) * 0.05F;

        boolean animateLeft =
                (leftArmPose != ArmPose.EMPTY && (leftArmPose != rightArmPose || attributes.isLeftHanded))
                && rightArmPose != ArmPose.BLOCK;
        boolean animateRight =
                (rightArmPose != ArmPose.EMPTY && (leftArmPose != rightArmPose || !attributes.isLeftHanded))
                && leftArmPose != ArmPose.BLOCK;

        if (animateRight) {
            rightArm.roll += cos;
            rightArm.pitch += sin;
        }

        if (animateLeft) {
            leftArm.roll += cos;
            leftArm.pitch += sin;
        }
    }

    protected void adjustBody(float rotateAngleX, float rotationPointY, float rotationPointZ) {
        adjustBodyComponents(rotateAngleX, rotationPointY, rotationPointZ);
        adjustNeck(rotateAngleX, rotationPointY, rotationPointZ);
    }

    protected void adjustBodyComponents(float rotateAngleX, float rotationPointY, float rotationPointZ) {
        body.pitch = rotateAngleX;
        body.rotationPointY = rotationPointY;
        body.rotationPointZ = rotationPointZ;

        upperTorso.pitch = rotateAngleX;
        upperTorso.rotationPointY = rotationPointY;
        upperTorso.rotationPointZ = rotationPointZ;
    }

    private void adjustNeck(float rotateAngleX, float rotationPointY, float rotationPointZ) {
        neck.setRotationPoint(NECK_ROT_X + rotateAngleX, rotationPointY, rotationPointZ);
    }

    @Override
    public void init(float yOffset, float stretch) {
        cuboidList.clear();

        initHead(yOffset, stretch);
        initBody(yOffset, stretch);
        initLegs(yOffset, stretch);
        initTail(yOffset, stretch);
    }

    protected void initHead(float yOffset, float stretch) {
        head = new PonyRenderer(this, 0, 0)
                                 .offset(HEAD_CENTRE_X, HEAD_CENTRE_Y, HEAD_CENTRE_Z)
                                 .around(HEAD_RP_X, HEAD_RP_Y + yOffset, HEAD_RP_Z - 2)
                                 .box(-4, -4, -4, 8, 8, 8, stretch);
        initEars(((PonyRenderer)head), yOffset, stretch);

        headwear = new PonyRenderer(this, 32, 0)
                                     .offset(HEAD_CENTRE_X, HEAD_CENTRE_Y, HEAD_CENTRE_Z)
                                     .around(HEAD_RP_X, HEAD_RP_Y + yOffset, HEAD_RP_Z - 2)
                                     .box(-4, -4, -4, 8, 8, 8, stretch + 0.5F);

        snout = new PonySnout(this);
        snout.init(yOffset, stretch);
    }

    protected void initEars(PonyRenderer head, float yOffset, float stretch) {
        head.tex(12, 16).box(-4, -6, 1, 2, 2, 2, stretch)  // right ear
                 .flip().box( 2, -6, 1, 2, 2, 2, stretch); // left ear
    }

    protected void initTail(float yOffset, float stretch) {
        tail = new PonyTail(this);
        tail.init(yOffset, stretch);
    }

    /**
     * Creates the main torso and neck.
     */
    protected void initBody(float yOffset, float stretch) {
        if (textureHeight == 64) {
            bodyOverlay.boxes.clear();
            cuboidList.add(bodyOverlay);
        }

        body = new PonyRenderer(this, 16, 16)
                    .around(HEAD_RP_X, HEAD_RP_Y + yOffset, HEAD_RP_Z)
                    .box(-4, 4, -2, 8, 8, 4, stretch);

        bodyOverlay.addBox(-4, 4, -2, 8, 8, 4, stretch + 0.25F);
        bodyOverlay.setRotationPoint(HEAD_RP_X, HEAD_RP_Y + yOffset, HEAD_RP_Z);

        upperTorso = new PlaneRenderer(this, 24, 0);
        upperTorso.offset(BODY_CENTRE_X, BODY_CENTRE_Y, BODY_CENTRE_Z)
                  .around(HEAD_RP_X, HEAD_RP_Y + yOffset, HEAD_RP_Z)
                    .tex(24, 0)    .east( 4, -4, -4, 8, 8, stretch)
                    .tex(4,  0)    .east( 4, -4,  4, 8, 4, stretch)
                    .tex(56, 0)  .bottom(-4,  4, -4, 8, 8, stretch)
                    .tex(36, 16)  .north(-4, -4,  8, 8, 4, stretch)
                                  .north(-4,  0,  8, 8, 4, stretch)
                                 .bottom(-4,  4,  4, 8, 4, stretch)
                .flipZ().tex(32, 20).top(-4, -4, -4, 8, 12, stretch)
                        .tex(24, 0).west(-4, -4, -4, 8, 8, stretch)
                        .tex(4, 0) .west(-4, -4,  4, 8, 4, stretch)
                // Tail stub
              .child(0)
                .tex(32, 0).top(-1, 2, 2, 2, 6, stretch)
                        .bottom(-1, 4, 2, 2, 6, stretch)
                          .east( 1, 2, 2, 2, 6, stretch)
                         .south(-1, 2, 8, 2, 2, stretch)
                  .flipZ().west(-1, 2, 2, 2, 6, stretch)
                  .rotate(0.5F, 0, 0);

        neck = new PlaneRenderer(this, 0, 16)
            .at(NECK_CENTRE_X, NECK_CENTRE_Y, NECK_CENTRE_Z)
            .rotate(NECK_ROT_X, 0, 0).around(HEAD_RP_X, HEAD_RP_Y + yOffset, HEAD_RP_Z)
            .north(0, 0, 0, 4, 4, stretch)
            .south(0, 0, 4, 4, 4, stretch)
             .east(4, 0, 0, 4, 4, stretch)
             .west(0, 0, 0, 4, 4, stretch);
    }

    protected void preInitLegs() {
        leftArm = new Cuboid(this, 32, 48);
        rightArm = new Cuboid(this, 40, 16);

        leftLeg = new Cuboid(this, 16, 48);
        rightLeg = new Cuboid(this, 0, 16);
    }

    protected void preInitLegwear() {
        leftArmOverlay.boxes.clear();
        rightArmOverlay.boxes.clear();
        leftLegOverlay.boxes.clear();
        rightLegOverlay.boxes.clear();
    }

    protected void initLegs(float yOffset, float stretch) {
        preInitLegs();
        preInitLegwear();

        int armLength = attributes.armLength;
        int armWidth = attributes.armWidth;
        int armDepth = attributes.armDepth;

        float rarmX = attributes.armRotationX;
        float rarmY = attributes.armRotationY;

        float armX = THIRDP_ARM_CENTRE_X;
        float armY = THIRDP_ARM_CENTRE_Y;
        float armZ = BODY_CENTRE_Z / 2 - 1 - armDepth;

        leftArm        .setRotationPoint( rarmX, yOffset + rarmY, 0);
        rightArm       .setRotationPoint(-rarmX, yOffset + rarmY, 0);
        leftArmOverlay .setRotationPoint(rarmX, yOffset + rarmY, 0);
        rightArmOverlay.setRotationPoint(-rarmX, yOffset + rarmY, 0);

        leftLeg        .setRotationPoint( rarmX, yOffset, 0);
        rightLeg       .setRotationPoint(-rarmX, yOffset, 0);
        leftLegOverlay .setRotationPoint(rarmX, yOffset, 0);
        rightLegOverlay.setRotationPoint(-rarmX, yOffset, 0);

        leftArm        .addBox(armX, armY, armZ, armWidth, armLength, armDepth, stretch);
        rightArm       .addBox(armX - armWidth, armY, armZ, armWidth, armLength, armDepth, stretch);
        leftArmOverlay .addBox(armX, armY, armZ, armWidth, armLength, armDepth, stretch + 0.25f);
        rightArmOverlay.addBox(armX - armWidth, armY, armZ, armWidth, armLength, armDepth, stretch + 0.25f);

        leftLeg        .addBox(armX, armY, armZ, armWidth, armLength, armDepth, stretch);
        rightLeg       .addBox(armX - armWidth, armY, armZ, armWidth, armLength, armDepth, stretch);
        leftLegOverlay .addBox(armX, armY, armZ, armWidth, armLength, armDepth, stretch + 0.25f);
        rightLegOverlay.addBox(armX - armWidth, armY, armZ, armWidth, armLength, armDepth, stretch + 0.25f);
    }

    @Override
    public float getRiderYOffset() {

        if (isChild()) {
            return 0.25F;
        }

        switch (getSize()) {
            case NORMAL: return 0.4F;
            case FOAL:
            case TALL:
            case BULKY:
            default: return 0.25F;
        }
    }

    /**
     * Sets the model's various rotation angles.
     *
     * @param entity    The entity we're being called for.
     * @param move      Entity motion parameter - i.e. velocity in no specific direction used in bipeds to calculate step amount.
     * @param swing     Degree to which each 'limb' swings.
     * @param ticks       Total whole and partial ticks since the entity's existance. Used in animations together with {@code swing} and {@code move}.
     * @param headYaw   Horizontal head motion in radians.
     * @param headPitch Vertical head motion in radians.
     * @param scale     Scaling factor used to render this model. Determined by the return value of {@link RenderLivingBase.prepareScale}. Usually {@code 0.0625F}.
     */
    @Override
    public void render(T entity, float move, float swing, float ticks, float headYaw, float headPitch, float scale) {
        renderStage(BodyPart.BODY, scale, this::renderBody);
        renderStage(BodyPart.NECK, scale, this::renderNeck);
        renderStage(BodyPart.HEAD, scale, this::renderHead);
        renderStage(BodyPart.LEGS, scale, this::renderLegs);

        if (textureHeight == 64) {
            renderStage(BodyPart.LEGS, scale, this::renderSleeves);
            renderStage(BodyPart.BODY, scale, this::renderVest);
        }

        renderStage(BodyPart.HEAD, scale, this::renderHelmet);
    }

    protected void renderStage(BodyPart part, float scale, Consumer<Float> action) {
        pushMatrix();
        transform(part);
        action.accept(scale);
        popMatrix();
    }

    protected void renderHead(float scale) {
        head.render(scale);
    }

    protected void renderHelmet(float scale) {
        headwear.render(scale);
    }

    protected void renderNeck(float scale) {
        scalef(0.9F, 0.9F, 0.9F);
        neck.render(scale);
    }

    protected void renderBody(float scale) {
        body.render(scale);
        upperTorso.render(scale);
        body.applyTransform(scale);
        tail.renderPart(scale, attributes.interpolatorId);
    }

    protected void renderVest(float scale) {
        bodyOverlay.render(scale);
    }

    protected void renderLegs(float scale) {
        if (!isSneaking) {
            body.applyTransform(scale);
        }

        leftArm.render(scale);
        rightArm.render(scale);
        leftLeg.render(scale);
        rightLeg.render(scale);
    }

    protected void renderSleeves(float scale) {
        leftArmOverlay.render(scale);
        rightArmOverlay.render(scale);
        leftLegOverlay.render(scale);
        rightLegOverlay.render(scale);
    }

    @Override
    public void transform(BodyPart part) {
        if (attributes.isSleeping) {
            rotatef(90, 1, 0, 0);
            rotatef(180, 0, 1, 0);
        }

        if (part == BodyPart.HEAD) {
            rotatef(attributes.motionPitch, 1, 0, 0);
        }

        PonyTransformation.forSize(getSize()).transform(this, part);
    }
}