src/game/java/net/minecraft/client/model/CodModel.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.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.LivingEntityRenderState;
import net.minecraft.util.Mth;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class CodModel extends EntityModel<LivingEntityRenderState> {
    private final ModelPart tailFin;

    public CodModel(ModelPart p_170494_) {
        super(p_170494_);
        this.tailFin = p_170494_.getChild("tail_fin");
    }

    public static LayerDefinition createBodyLayer() {
        MeshDefinition meshdefinition = new MeshDefinition();
        PartDefinition partdefinition = meshdefinition.getRoot();
        int i = 22;
        partdefinition.addOrReplaceChild(
            "body", CubeListBuilder.create().texOffs(0, 0).addBox(-1.0F, -2.0F, 0.0F, 2.0F, 4.0F, 7.0F), PartPose.offset(0.0F, 22.0F, 0.0F)
        );
        partdefinition.addOrReplaceChild(
            "head", CubeListBuilder.create().texOffs(11, 0).addBox(-1.0F, -2.0F, -3.0F, 2.0F, 4.0F, 3.0F), PartPose.offset(0.0F, 22.0F, 0.0F)
        );
        partdefinition.addOrReplaceChild(
            "nose", CubeListBuilder.create().texOffs(0, 0).addBox(-1.0F, -2.0F, -1.0F, 2.0F, 3.0F, 1.0F), PartPose.offset(0.0F, 22.0F, -3.0F)
        );
        partdefinition.addOrReplaceChild(
            "right_fin",
            CubeListBuilder.create().texOffs(22, 1).addBox(-2.0F, 0.0F, -1.0F, 2.0F, 0.0F, 2.0F),
            PartPose.offsetAndRotation(-1.0F, 23.0F, 0.0F, 0.0F, 0.0F, (float) (-Math.PI / 4))
        );
        partdefinition.addOrReplaceChild(
            "left_fin",
            CubeListBuilder.create().texOffs(22, 4).addBox(0.0F, 0.0F, -1.0F, 2.0F, 0.0F, 2.0F),
            PartPose.offsetAndRotation(1.0F, 23.0F, 0.0F, 0.0F, 0.0F, (float) (Math.PI / 4))
        );
        partdefinition.addOrReplaceChild(
            "tail_fin", CubeListBuilder.create().texOffs(22, 3).addBox(0.0F, -2.0F, 0.0F, 0.0F, 4.0F, 4.0F), PartPose.offset(0.0F, 22.0F, 7.0F)
        );
        partdefinition.addOrReplaceChild(
            "top_fin", CubeListBuilder.create().texOffs(20, -6).addBox(0.0F, -1.0F, -1.0F, 0.0F, 1.0F, 6.0F), PartPose.offset(0.0F, 20.0F, 0.0F)
        );
        return LayerDefinition.create(meshdefinition, 32, 32);
    }

    public void setupAnim(LivingEntityRenderState p_369038_) {
        super.setupAnim(p_369038_);
        float f = p_369038_.isInWater ? 1.0F : 1.5F;
        this.tailFin.yRot = -f * 0.45F * Mth.sin(0.6F * p_369038_.ageInTicks);
    }
}