OGL.Matrix[x][y] || [y][x]?

Graphics and GPU Programming Programming

Started by Esap1 June 25, 2000 06:12 PM

2 comments, last by Esap1 23 years, 10 months ago

122

Author

June 25, 2000 06:12 PM

In OpenGL, does a Matrix get called as Matrix[X][Y], or is it the other way around? for example: 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 If I wanted the 1, would I get it by Matrix[1][3], or by Matrix[3][1]? Thanks for the help, later

Nate

122

June 25, 2000 09:40 PM

OpenGL matricies are stored in column major order, so use matrix[col][row]. A OpenGL matrix for 16 values would look like this in memory.

0 4 8 12
1 5 9 13
2 6 10 14
3 7 11 15

Hope this helps.

Oops messed up.

Nate
http://nate.scuzzy.net

Edited by - Nate on June 25, 2000 11:58:46 PM

Natehttp://nate.scuzzy.net

acw83

174

June 25, 2000 10:50 PM

Standard mathematical rotation is M[r][c], OpenGL uses M[c][r] c = column, r = row

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