Can I calculate the normals in gpu?

Question

I have an opengl application that loads dxf and draws it on the screen, every time I need to calculate the normals. is there any way to calculate normals in GPU instead of CPU? if so, how?

Answer 1

Yes it is possible. You will want to know about shaders in Cg .

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Answer 2

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Answer 3

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• Cut and paste any tutorial to include a geometric shader in your application.
• The shader should look like this:

//glsl shader

#version 120
#extension GL_EXT_geometry_shader4 : enable
void main(void)
{
// Compute per-face normal
    vec4 d1 = gl_PositionIn[1] - gl_PositionIn[0];
    vec4 d2 = gl_PositionIn[2] - gl_PositionIn[0];
    gl_Normal = cross(d1,d2);

// Emit all input vertices
    for(i=0; i< gl_VerticesIn; i++){
        gl_Position = gl_PositionIn[i];
        EmitVertex();
    }
    EndPrimitive();
}   

Answer 4

Take a look glEnable(GL_AUTO_NORMAL).