Tutorial 14 Bump Normal Mapping

Very easy :O There’s an extra mTextureManager.addTexture() parameter that you can use to indicate that you’re adding a Bump/Normal map. A material called BumpmapMaterial should be used for this:

Bitmap diffuseTexture = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.diffuse_texture);
Bitmap bumpTexture = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.bump_texture);

myObject.setMaterial(new BumpmapMaterial());
myObject.addTexture(mTextureManager.addTexture(diffuseTexture, TextureType.DIFFUSE));
myObject.addTexture(mTextureManager.addTexture(bumpTexture, TextureType.BUMP));

To see this in full splendor you can add in an animated light:

Animation3D lightAnim = new RotateAroundAnimation3D(new Number3D(), Axis.Z, 6);
lightAnim.setDuration(5000);
lightAnim.setRepeatCount(Animation3D.INFINITE);
lightAnim.setTransformable3D(mLight);
lightAnim.start();

That’s all there is to it. For a full example check out the RajawaliExamples project on Github.

SIMPLIFIED IMAGE MAPPING

As of pull request #438 you can apply image maps directly to the stock materials to simplify alpha, specular, and normal mapping.

Map support by material:
PhongMaterial - Bump/Norm, Spec, Alpha
GouraudMaterial - Spec, Alpha
SimpleMaterial - Alpha

Here is an example of how mapping is utilized:

PhongMaterial myMappedMaterial = new PhongMaterial();
myMappedMaterial.addTexture(mTextureManager.addTexture(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.diffuseTexture), TextureType.DIFFUSE));
myMappedMaterial.addTexture(mTextureManager.addTexture(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.alphaTexture), TextureType.ALPHA)); //Black and white alpha map where white is opaque
myMappedMaterial.addTexture(mTextureManager.addTexture(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.specularTexture), TextureType.SPECULAR)); //Black and white spec map where white is shiny and black is matte
myMappedMaterial.addTexture(mTextureManager.addTexture(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.normalTexture), TextureType.BUMP)); //RGB normal map

BaseObject3D mObject = newBaseObject3D();
mObject.setMaterial(myMappedMaterial);
mObject.addLight(new PointLight());

addChild(mObject);