Which Matrixformat does Irrlicht use

r2d2 · Post by **r2d2** » Sat Jun 12, 2004 11:34 pm

This Document OpenGL
| 0 1 2 3 | | 0 4 8 12 |
| | | |
| 4 5 6 7 | | 1 5 9 13 |
M = | | M = | |
| 8 9 10 11 | | 2 6 10 14 |
| | | |
| 12 13 14 15 | | 3 7 11 15 |

Does irrlicht use the standard or the opengl notation?

Gorgon Zola · Post by **Gorgon Zola** » Sun Jun 13, 2004 10:50 am

DirectX format

r2d2 · Post by **r2d2** » Sun Jun 13, 2004 10:53 am

how is the direct X Matrix format aligned? like the opengl or like the standard?

Gorgon Zola · Post by **Gorgon Zola** » Sun Jun 13, 2004 12:42 pm

from the matrix4 source:

Code: Select all

//! 4x4 matrix. Mostly used as transformation matrix for 3d calculations.
/* Matrix4 is mainly used by the Irrlicht engine for doing transformations.
The matrix is a D3D style matrix, row major with translations in the 4th row.
*/

then:

http://www.google.ch/search?sourceid=na ... +row+major

then take the first link:
http://www.gamedev.net/community/forums ... id=198818

and there you are

OpenGL uses column-major order DirectX uses row-major order.
But, Irrlicht does the translation for you. All you have to do is deal with Irrlicht Matrix4 which happens to be also row major order. (many math books definie a matrix to be column major order ...)
Btw. to convert you only have to build the transposed matrix.