i have this model:

 

// Date: 05/08/2014 00:53:59
// Template version 1.1
// Java generated by Techne
// Keep in mind that you still need to fill in some blanks
// - ZeuX






package com.simon.simonsores.mobs;

import net.minecraft.client.model.ModelBase;
import net.minecraft.client.model.ModelRenderer;
import net.minecraft.entity.Entity;
import net.minecraft.util.MathHelper;

public class Amon extends ModelBase
{
  //fields
    ModelRenderer head;
    ModelRenderer body1;
    ModelRenderer dxarm1;
    ModelRenderer sxarm1;
    ModelRenderer dxarm2;
    ModelRenderer sxarm2;
    ModelRenderer body2;
    ModelRenderer tail1;
    ModelRenderer tail2;
    ModelRenderer tail3;
    ModelRenderer tail4;
    ModelRenderer tail5;
    ModelRenderer tail6;
    ModelRenderer tail7;
    ModelRenderer tail8;
    ModelRenderer dxarm3;
    ModelRenderer sxarm3;
  
  public Amon()
  {
    textureWidth = 128;
    textureHeight = 128;
    
      head = new ModelRenderer(this, 96, 0);
      head.addBox(0F, 0F, 0F, 8, 8, ;
      head.setRotationPoint(0F, -17F, -31F);
      head.setTextureSize(128, 128);
      head.mirror = true;
      setRotation(head, 0F, 0F, 0F);
      body1 = new ModelRenderer(this, 92, 17);
      body1.addBox(0F, 0F, 0F, 10, 16, ;
      body1.setRotationPoint(-1F, -8F, -30F);
      body1.setTextureSize(128, 128);
      body1.mirror = true;
      setRotation(body1, 0.5948578F, 0F, 0F);
      dxarm1 = new ModelRenderer(this, 0, 82);
      dxarm1.addBox(0F, 0F, 0F, 4, 10, 4);
      dxarm1.setRotationPoint(-5F, -8F, -29F);
      dxarm1.setTextureSize(128, 128);
      dxarm1.mirror = true;
      setRotation(dxarm1, 0.1858931F, 0F, 0F);
      sxarm1 = new ModelRenderer(this, 0, 99);
      sxarm1.addBox(0F, 0F, 0F, 4, 10, 4);
      sxarm1.setRotationPoint(9F, -8F, -29F);
      sxarm1.setTextureSize(128, 128);
      sxarm1.mirror = true;
      setRotation(sxarm1, 0.1858931F, 0F, 0F);
      dxarm2 = new ModelRenderer(this, 21, 56);
      dxarm2.addBox(0F, 0F, 0F, 4, 10, 4);
      dxarm2.setRotationPoint(-5F, 1F, -27F);
      dxarm2.setTextureSize(128, 128);
      dxarm2.mirror = true;
      setRotation(dxarm2, 0F, 0F, 0F);
      sxarm2 = new ModelRenderer(this, 38, 56);
      sxarm2.addBox(0F, 0F, 0F, 4, 10, 4);
      sxarm2.setRotationPoint(9F, 1F, -27F);
      sxarm2.setTextureSize(128, 128);
      sxarm2.mirror = true;
      setRotation(sxarm2, 0F, 0F, 0F);
      dxarm3 = new ModelRenderer(this, 21, 72);
      dxarm3.addBox(0F, 0F, 0F, 4, 8, 5);
      dxarm3.setRotationPoint(-5F, 8F, -27F);
      dxarm3.setTextureSize(128, 128);
      dxarm3.mirror = true;
      setRotation(dxarm3, -0.4461433F, 0F, 0F);
      sxarm3 = new ModelRenderer(this, 21, 87);
      sxarm3.addBox(0F, 0F, 0F, 4, 8, 5);
      sxarm3.setRotationPoint(9F, 8F, -27F);
      sxarm3.setTextureSize(128, 128);
      sxarm3.mirror = true;
      setRotation(sxarm3, -0.4461433F, 0F, 0F);
      body2 = new ModelRenderer(this, 88, 42);
      body2.addBox(0F, 0F, 0F, 12, 9, ;
      body2.setRotationPoint(-2F, 3F, -22F);
      body2.setTextureSize(128, 128);
      body2.mirror = true;
      setRotation(body2, 0.4833219F, 0F, 0F);
      tail1 = new ModelRenderer(this, 0, 0);
      tail1.addBox(0F, 0F, 0F, 14, 9, ;
      tail1.setRotationPoint(-3F, 10F, -19F);
      tail1.setTextureSize(128, 128);
      tail1.mirror = true;
      setRotation(tail1, 0.7435722F, 0F, 0F);
      tail2 = new ModelRenderer(this, 0, 19);
      tail2.addBox(0F, 0F, 0F, 14, 8, ;
      tail2.setRotationPoint(-3F, 16F, -14F);
      tail2.setTextureSize(128, 128);
      tail2.mirror = true;
      setRotation(tail2, 1.003822F, 0F, 0F);
      tail3 = new ModelRenderer(this, 0, 36);
      tail3.addBox(0F, 0F, 0F, 14, 10, ;
      tail3.setRotationPoint(-3F, 20F, -9F);
      tail3.setTextureSize(128, 128);
      tail3.mirror = true;
      setRotation(tail3, 1.301251F, 0F, 0F);
      tail4 = new ModelRenderer(this, 45, 0);
      tail4.addBox(0F, 0F, 0F, 12, 10, ;
      tail4.setRotationPoint(-2F, 23F, 0F);
      tail4.setTextureSize(128, 128);
      tail4.mirror = true;
      setRotation(tail4, 1.59868F, 0F, 0F);
      tail5 = new ModelRenderer(this, 45, 19);
      tail5.addBox(0F, 0F, 0F, 10, 10, ;
      tail5.setRotationPoint(-1F, 23F, 9F);
      tail5.setTextureSize(128, 128);
      tail5.mirror = true;
      setRotation(tail5, 1.59868F, 0F, 0F);
      tail6 = new ModelRenderer(this, 45, 38);
      tail6.addBox(0F, 0F, 0F, 8, 10, 6);
      tail6.setRotationPoint(0F, 22F, 17F);
      tail6.setTextureSize(128, 128);
      tail6.mirror = true;
      setRotation(tail6, 1.59868F, 0F, 0F);
      tail7 = new ModelRenderer(this, 0, 56);
      tail7.addBox(0F, 0F, 0F, 6, 10, 4);
      tail7.setRotationPoint(1F, 21F, 24F);
      tail7.setTextureSize(128, 128);
      tail7.mirror = true;
      setRotation(tail7, 1.59868F, 0F, 0F);
      tail8 = new ModelRenderer(this, 0, 72);
      tail8.addBox(0F, 0F, 0F, 4, 5, 2);
      tail8.setRotationPoint(2F, 20F, 32F);
      tail8.setTextureSize(128, 128);
      tail8.mirror = true;
      setRotation(tail8, 1.59868F, 0F, 0F);
      
  }
  
  public void render(Entity par1Entity, float par2, float par3, float par4, float par5, float par6, float par7)
  {
    super.render(par1Entity, par2, par3, par4, par5, par6, par7);
    setRotationAngles(par2, par3, par4, par5, par6, par7, par1Entity);
    head.render(par7);
    body1.render(par7);
    dxarm1.render(par7);
    sxarm1.render(par7);
    body2.render(par7);
    tail1.render(par7);
    tail2.render(par7);
    tail3.render(par7);
    tail4.render(par7);
    tail5.render(par7);
    tail6.render(par7);
    tail7.render(par7);
    tail8.render(par7);
  }
  
  private void setRotation(ModelRenderer model, float x, float y, float z)
  {
    model.rotateAngleX = x;
    model.rotateAngleY = y;
    model.rotateAngleZ = z;
  }
  
  public void setRotationAngles(float par1, float par2, float par3, float par4, float par5, float par6, Entity par7Entity)
  {
    super.setRotationAngles(par1, par2, par3, par4, par5, par6, par7Entity);
    
    head.rotateAngleY = par4 / 57.29578F;
    head.rotateAngleX = par5 / 57.29578F;
    
    this.dxarm1.rotateAngleX = MathHelper.cos(par1 * 0.6662F) * 1.4F * par2;
  this.dxarm1.rotateAngleY = 0.0F;
  this.sxarm1.rotateAngleX = MathHelper.cos(par1 * 0.6662F + (float)Math.PI) * 1.4F * par2;
  this.sxarm1.rotateAngleY = 0.0F;

  this.dxarm1.addChild(dxarm2);
  this.dxarm2.addChild(dxarm3);
  this.sxarm1.addChild(sxarm2);
  this.sxarm2.addChild(sxarm3);

  }

}

 

I'm making the arms animation, I just put the addChild the I removed the renders but now I don't understund how to reset the rotation points: if the dxarm1 is -5F, -8F, -29F and dxarm2 is -5F, 1F, -27F Ihave to change dxarm2 in -0F, 9F, 2F or no? and if I change it in this, then for reset the rotation point of dxarm3 that is -5F, 8F, -27F I have to do (-5F, 8F, -27F) -  (-0F, 9F, 2F) that is (-5F, -1F, -29F) or no? I tested it in game and the arms are seen as in this picture:

 

http://i1102.photobucket.com/albums/g454/2010simoDK/mmm.png

 

another thing you can see in the picture is the head animation isn't seen good, this because the rotation point of the head is here:

 

http://i1102.photobucket.com/albums/g454/2010simoDK/mmmm.png

 

so also how can I reset the rotation point of the head at the center?

 

 

 

*sigh* why are all good artists and ai writers already working on their own project?

And I have problems with a simple maggot....

 

Rotation point can be moved in techne: http://www.minecraftforge.net/wiki/Modelling_in_Techne#Making_a_model

Rotation point can be moved in techne: http://www.minecraftforge.net/wiki/Modelling_in_Techne#Making_a_model

 

No, in this case he's asking about child parts of the model.  Child parts are the right way to do manage complex animations, but rotation points need to be changed from the Techne original rotation points.

 

In answer to the original question:  the rotation point of a child part is *relative* to the parent part.  So if you had an original rotation point before you made it a child, you need to subtract the parent's rotation point after you make it a child.  in other words just take the x, y, z of the rotation point and subtract the values from the parent.

 

Basically the child's rotation point should indicate where it is based from the parent's rotation point.  I hope you get the idea.

then it isn't how I have told?

 

dxarm2 (child) -5F, 1F, -27F - dxarm1 (parent) -5F, -8F, -29F = -0F, 9F, 2F (new rotation point dxarm2) or no?

then it isn't how I have told?

 

dxarm2 (child) -5F, 1F, -27F - dxarm1 (parent) -5F, -8F, -29F = -0F, 9F, 2F (new rotation point dxarm2) or no?

 

Yes, that looks like the right idea.

 

I find it is easiest to get the model correct by stopping all the rotations until you are sure all the rotation points are correct.  So I suggest commenting out all rotations for now to confirm that you got this part right.