src/game/java/net/minecraft/client/model/CreeperModel.java

package net.minecraft.client.model;

import net.minecraft.client.model.geom.ModelPart;
import net.minecraft.client.model.geom.PartPose;
import net.minecraft.client.model.geom.builders.CubeDeformation;
import net.minecraft.client.model.geom.builders.CubeListBuilder;
import net.minecraft.client.model.geom.builders.LayerDefinition;
import net.minecraft.client.model.geom.builders.MeshDefinition;
import net.minecraft.client.model.geom.builders.PartDefinition;
import net.minecraft.client.renderer.entity.state.CreeperRenderState;
import net.minecraft.util.Mth;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class CreeperModel extends EntityModel<CreeperRenderState> {
    private final ModelPart head;
    private final ModelPart rightHindLeg;
    private final ModelPart leftHindLeg;
    private final ModelPart rightFrontLeg;
    private final ModelPart leftFrontLeg;
    private static final int Y_OFFSET = 6;

    public CreeperModel(ModelPart p_170524_) {
        super(p_170524_);
        this.head = p_170524_.getChild("head");
        this.leftHindLeg = p_170524_.getChild("right_hind_leg");
        this.rightHindLeg = p_170524_.getChild("left_hind_leg");
        this.leftFrontLeg = p_170524_.getChild("right_front_leg");
        this.rightFrontLeg = p_170524_.getChild("left_front_leg");
    }

    public static LayerDefinition createBodyLayer(CubeDeformation p_170526_) {
        MeshDefinition meshdefinition = new MeshDefinition();
        PartDefinition partdefinition = meshdefinition.getRoot();
        partdefinition.addOrReplaceChild(
            "head",
            CubeListBuilder.create().texOffs(0, 0).addBox(-4.0F, -8.0F, -4.0F, 8.0F, 8.0F, 8.0F, p_170526_),
            PartPose.offset(0.0F, 6.0F, 0.0F)
        );
        partdefinition.addOrReplaceChild(
            "body",
            CubeListBuilder.create().texOffs(16, 16).addBox(-4.0F, 0.0F, -2.0F, 8.0F, 12.0F, 4.0F, p_170526_),
            PartPose.offset(0.0F, 6.0F, 0.0F)
        );
        CubeListBuilder cubelistbuilder = CubeListBuilder.create().texOffs(0, 16).addBox(-2.0F, 0.0F, -2.0F, 4.0F, 6.0F, 4.0F, p_170526_);
        partdefinition.addOrReplaceChild("right_hind_leg", cubelistbuilder, PartPose.offset(-2.0F, 18.0F, 4.0F));
        partdefinition.addOrReplaceChild("left_hind_leg", cubelistbuilder, PartPose.offset(2.0F, 18.0F, 4.0F));
        partdefinition.addOrReplaceChild("right_front_leg", cubelistbuilder, PartPose.offset(-2.0F, 18.0F, -4.0F));
        partdefinition.addOrReplaceChild("left_front_leg", cubelistbuilder, PartPose.offset(2.0F, 18.0F, -4.0F));
        return LayerDefinition.create(meshdefinition, 64, 32);
    }

    public void setupAnim(CreeperRenderState p_361525_) {
        super.setupAnim(p_361525_);
        this.head.yRot = p_361525_.yRot * (float) (Math.PI / 180.0);
        this.head.xRot = p_361525_.xRot * (float) (Math.PI / 180.0);
        float f = p_361525_.walkAnimationSpeed;
        float f1 = p_361525_.walkAnimationPos;
        this.rightHindLeg.xRot = Mth.cos(f1 * 0.6662F) * 1.4F * f;
        this.leftHindLeg.xRot = Mth.cos(f1 * 0.6662F + (float) Math.PI) * 1.4F * f;
        this.rightFrontLeg.xRot = Mth.cos(f1 * 0.6662F + (float) Math.PI) * 1.4F * f;
        this.leftFrontLeg.xRot = Mth.cos(f1 * 0.6662F) * 1.4F * f;
    }
}