Shading

Engines, Libraries and Tools Xith3D Forums
#1

hi, I tried to use shading in my small program. It is actually the HelloXith3D-code. I deactivated the colors of the cube, put a PointLight to the cam’s position and enabled lighting in the cube’s material and in the RenderAttributes of the canvasPeer.
Now the cube is lit in a nice red light but without shading. You can’t see the edges in front of the cam. It’s like one level surface that is now red.
I belive someone here can help me,
thx & cu

#2

what do you set for the material? (diffuse shading,…)
Have you also added an Ambientlight? If yes, this would explain, why there’s no shading.

#3

hi & thx for your answer.
I use the normal HelloXith3D-demo with a light:

PointLight l=new PointLight();
l.setEnable(true);
l.setColor(new Color3f(1,0,0));
l.setLocation(new Point3f(0,0,4f));
scene.addChild(l);

and the cube with some attributes:

Geometry geo = Cube.createCubeViaTriangles(0, 0, 0, 1, true);
Appearance ap=new Appearance();
Material m=new Material(true);
m.setDiffuseColor(1,0.5f,0.5f);
m.setEmissiveColor(new Color3f(1,0.5f,0.5f));
m.setShininess(0.9f);
m.setSpecularColor(1,0.5f,0.5f);
ap.setMaterial(m);
ColoringAttributes ca=new ColoringAttributes(new Color3f(1,0.5f,0.5f), ColoringAttributes.SHADE_FLAT);
ap.setColoringAttributes(ca);
Shape3D sh=new Shape3D(geo, ap);

#4

I played a bit with the settings but none did what I wanted them to do :frowning:

#5

You shouldn’t set Emissive Color I think, cause it makes the Object shine. I would set it like that:


   Material m=new Material(true);
  m.setAmbientColor(0.3f,0.3f,0.3f); // You'll need some ambient settings, too
  m.setDiffuseColor(1,0.5f,0.5f);
  m.setSpecularColor(0,0,0);    // disable reflections (I don't like them)
  • You will have to use setColorTarget I think, but I don’t know what the best mode is for you and even if you need to set it.

Arne

#6

hi & thx. I’m trying it on Monday, althoug I don’t know how that influences shading.
cu

#7

:frowning: it doesn’t work. Is it really that complicated to use simple shading in Xith? Has noone ever used it succesfully? In poor openGL it’s quite simple. It seems I have to use it directly.
cu

#8

no don’t !! It works fine (for me, so it will probably also for you :wink: )

here is my code I use succesfully to set my Appearance:


         Appearance appear = new Appearance();
         Material m = new Material(true);
         m.setAmbientColor(0.5f,0.5f,0.5f);
         m.setDiffuseColor(1,1,1);
         //m.setEmissiveColor(0.5f,0.5f,0.5f);
         m.setSpecularColor(0.0f,0.0f,0.0f);
         if(textures.size() == 0) m.setColorTarget(m.AMBIENT_AND_DIFFUSE);
         else  m.setColorTarget(m.NONE);
         appear.setMaterial(m);
         TextureUnitState[] texStates = new TextureUnitState[textures.size()];
        for(int i = 0; i < textures.size(); i++) {
            texStates[i] = getTexture(i).calculateTextureUnitState();
        }
        appear.setTextureUnitState(texStates);

Do you generate Normals for your object?
What does happen when you don’t add the light?
Could you also post an image?

Arne

#9

thank you very much arne, it finally works now :slight_smile:
I forgot to add normals :frowning:
thx & cu