- finally we add an event hook on mesh initialization in order to add diffuse color to
vertices.
InitBumpMesh method :
- this method is called on mesh initialization
- we lookup the cube mesh and add a diffuse part to vertex declaration
- we fill a new vertex buffer with the old vertices + diffuse information
- we setup a TBN matrix for future processing
MoveBumpCube method :
- this method is called before each frame rendering
- we update the point light position to make it look realistic
- we compute the new light position
- we update vertices diffuse information (vertex buffer lock) by encoding the light
normal vector informations for hardware processing.
// texture 0 parameters
cube.RenderStates.Texture[0] = this.GetTexture("normalmap2.tga");
cube.RenderStates.TextureStates[0].ColorArg1 = BrumeTextureParams.ARG_TEXTURE;
cube.RenderStates.TextureStates[0].ColorArg2 = BrumeTextureParams.ARG_DIFFUSE;
cube.RenderStates.TextureStates[0].ColorOperation = BrumeTextureParams.OP_DOT_PRODUCT3;
// texture 1 parameters
cube.RenderStates.Texture[1] = this.GetTexture("multitex2.tga");
cube.RenderStates.TextureStates[1].ColorArg1 = BrumeTextureParams.ARG_TEXTURE;
cube.RenderStates.TextureStates[1].ColorArg2 = BrumeTextureParams.ARG_CURRENT;
cube.RenderStates.TextureStates[1].ColorOperation = BrumeTextureParams.OP_MODULATE;
This tutorial will show you how to adapt a simple Dot3 Bump mapping sample to Brume game engine.
Note that this tutorial is really simple because you can find a lot of information on Dot3 bump mapping technique on the Internet.
We just wanted to outline Brume's integration capabilities.
Here is a quick explanation of the steps achieved in the source code of this tutorial :
InitGame method :
- we define a point light that will virtually shadow a cube (look at the PointLight
tutorial for more detailed information)
- we create a cube that will support bump mapping (the cube will have a dynamic vertex
buffer because we need to add a diffuse color to the vertices)
- we setup texture's stages to achieve dot3 bump mapping :
Tutorial : Dot3 Bump mapping