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How can I vary the point size in OpenGL glBegin(GL_POINTS)?

tibur:
You can use point sprite: enable it using glEnable(GL_VERTEX_PROGRAM_POINT_SIZE); and then you can use gl_PointSize attribute in your vertex program.

Vertex shader example taken from an OpenGL discussion thread:

void main() {
    gl_FrontColor=gl_Color;
    gl_PointSize = gl_Normal.x;
    gl_Position = ftransform();
}

参考：
Point_primitives
Vertex_Shader