[gameprogrammer] Re: Shader

They are programs that are sent to your video card. There are two kinds: Vertex and Pixel.
Vertex shaders take shader constants and a vertex lists, defined by your 3d models. They output the modified vertices, along with other per-vertex data, to the video card. For example, you may pass a location as a constant, a float as another. I can use that to move the vertices away from the point, thus creating a hole in my model. The video card then uses the vertices to map the model to pixels, along with per-pixel data created by or passed through the vertex shader.
The pixels are sent to the pixel shader, along with constants, and access to loaded textures. The pixel shader can then manipulate the pixels as desired, such as by adding two textures together, and outputting the final color as the sum of those two textures. The output of the pixel shader is only the final pixel color. 

Edilson Vasconcelos de Melo Junior wrote:

Hi,

What are shaders? What they do? What is the best example of their use?

Thanks,
Dirso. 

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