double matrix[16];
glGetDoublev(GL_MODELVIEW_MATRIX, matrix);
matrix[0] = matrix[5] = matrix[10] = matrix[11] = 1.0;
matrix[1] = matrix[2] = matrix[3] = matrix[4] = 0.0;
matrix[6] = matrix[7] = matrix[8] = matrix[9] = 0.0;
glLoadMatrixd(matrix);
problems with billboarding
November 21, 2005 08:14 PM
hi
i am currently having a problem with trying to billboard my particle system when i try and do it the particle system just disappears. below is the code that i am currently using
The following is whats in the matrix when the camera is updated
1 0 0 0
0 1 0 0
0 0 1 1
0 0 0 1
just before i try to do billboarding
1 0 0 0
0 1 0 0
0 0 1 1
0 0 0 1
and after i do billboarding(before i popthe matrix)
1 0 0 0
0 1 0 0
0 0 1 1
0 0 1 1
any help with the would be great everyone else in my class has been able to ably the code above and get the correct results and i just don't know whats going wrong
340
November 23, 2005 09:31 AM
Some theory:
http://www.lighthouse3d.com/opengl/billboarding/index.php?billCheat
You only need to set the upper 3x3 matrix to an identity:
Cheers,
- llvllatrix
http://www.lighthouse3d.com/opengl/billboarding/index.php?billCheat
You only need to set the upper 3x3 matrix to an identity:
double matrix[16];glGetDoublev(GL_MODELVIEW_MATRIX, matrix);// Always try to keep array assignments like these as clear as possible; it is very easy to make a mistake here.matrix[0] = 1.0;matrix[1] = 0.0;matrix[2] = 0.0;matrix[4] = 0.0;matrix[5] = 1.0;matrix[6] = 0.0;matrix[8] = 0.0;matrix[9] = 0.0;matrix[10] = 1.0;glLoadMatrixd(matrix);Cheers,
- llvllatrix
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