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d3d matrix

Started by Trugath Oct 18, 2000 at 9:24 AM 1 reply 400+ views

Original Post

Oct 18, 2000 at 9:24 AM

Ive been having big problems getting my scene and object matrix''s set up. i create the scene fine but when i blit the surface the objects arn''t there. i beleave i have mis oriented the camera and/or habe the objects in the scene placed wrongly. is there anyplace i can get good information on matrix''s becouse all the ones i have read allready are vary vauge and dont explain what each value in the matrix does apart from _43. ta, sorry im a bit of a newbie at this. ---------- ---Trugath

dennis428

Oct 18, 2000 at 5:03 PM

Sure, I can help a bit.

First, to be sure that the blitting worked, try setting an other ambient color. For example 0x0c0c0c0c. If the screen changes color, the viewport is blit.

lpd3dDevice->SetRenderState( D3DRENDERSTATE_AMBIENT, 0x0c0c0c0c );

Second, the DirectX SDK help has a really good part on matrices. You should really check that one out.
Know that if you set an Identity Matrix,
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
nothing moves.

Then try to experiment with the _41, _42 and _43 values (bottom row) of a matrix. These represent the translation (move) of the camera (or an object for that matter). For example, if you want to move 8 units to the right and 4 to the front the matrix you set would look like this:
1 0 0 0
0 1 0 0
0 0 1 0
8 0 4 1
If you don''t rotate or scale, the 1 (one) values always remain.
Start with small values too, becourse a too great movement could move the object (or camera) out of your sight.
Try rotating only if you got the whole translation part covert.

Good luck

Dennis

visit my site, please:
members.nbci.com/dennis428/default.htm

Trugath

Author

Trugath

Oct 20, 2000 at 9:18 AM

Ta man thx alot.

I understand it now.

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