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Using matrices for rotation

Started by JimmyFo Oct 3, 2004 at 7:39 PM 3 replies 900+ views

Original Post

Oct 3, 2004 at 7:39 PM

Hi all - I have a question concerning using my own matrices for translating and rotating the camera without the help of the opengl functions like gluLookAt, gluPerspective, and MatrixMode etc. I am familiar with the theory and have that understood - what I don't get is what to put in my display and reshape functions: void display() { ... glBegin(etc) glEnd } void reshape(height width) { setIdentity() ... } How to I reference the arrays I want and make sure they get displayed? Thanks a lot -james

nts

115

nts

Oct 4, 2004 at 2:44 AM

if you have the matricies created then look into 'glLoadMatrixf' to load the matrix in (set the mode first, PROJECTION or MODELVIEW). If you want to take a look at the implementation of 'gluLookAt' (how to create them yourself from scratch) or something then download 'Mesa3D', glu is included in the source code.

Maybe you can be a bit more specific of what you want, a little confused

HTH

JimmyFo

Author

JimmyFo

Oct 4, 2004 at 7:52 PM

Thanks for that, I did a brief perusal and I think it may work - what I was trying to do was basically make my own graphics pipeline instead of using opengls (i.e. the glulookat/perspective/rotate/translate etc) - I understand the matrix manipulations, I just am wondering about how to use code to take them and manipulate them ( the display).

Thanks :)

-james

Trienco

146

Trienco

Oct 5, 2004 at 12:52 AM

Quote:
Original post by JimmyFo
what I was trying to do was basically make my own graphics pipeline instead of using opengls

so basically you want to drop opengl and write a software rasterizer? because multiplying a few matrices is NOT the pipeline and i wouldnt know how you want to write your own pipeline without dropping hardware support.

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