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badkeeper3410

OpenGL Need help in Opengl Lighting

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hello all. Here I need some help in Opengl lightPosition. I read the readbook 1.4,and found something maybe wrong. In the book, it set a light like follow: init() { ..... GLfloat light_position = {0.0,0.0,0.0,1.0}; glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glLightfv(GL_LIGHT0,GL_POSITION,light_position); } display() { ..... gluLookAt(...); //here change the view matrix,the center is (0,0,0) glutSolodTorus(); //or other geometric } and it said,when the camera move,the light will move with it. and this way can simulate flashlight or candle in hand.Is that right? If the light's position was treated like anyother vertex, It should be multi the modelview Matrix. but if the position moved like the eye,it should be multi the modelview's Invert matrix? please help me

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Ok,I found some information on www.opengl.org,and understand.Opengl first transform lightposition from world coordinate to eye coordinate,and keep it; the
light operations(computer color) are all in eye coordinate.so if set the light position on (0,0,0) with identity modelview matrix, the light will aways use this coordinate like eye coordinate until set lightposition again.
Is that right? If i am wrong ,please tell me. thanks:)

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