apan156

I have searched all over the web, and yet I cant find any info about how to do this..

I'm creating a simple 2d engine using directx8, and I need to know some way to rotate textures. I know there is a way, I just dont know how ^^

I wouldnt have posted here if I hadn't searched my *** off already. Thanks, I'm grateful for any help or pointers

Qua

What approach are you using? Have you UV mapped the textures to your vertices or are you using a sprite class?

apan156

I mapped the textures to vertices ^^

Mattyski

Hi, err it maybe late to reply now but what the hell.....

Hopefully I'll explain it correctly:
If the shape is like a simple square and the verticle numbers are:

1-------2
| |
| |
4-------3

and the UV(more like X and Y) mappings are as follows:

1=0,0
2=1,0
3=1,1
4=0,1

to rotate the texture around move the UV values from 1 to 2, 2 to 3, 3 to 4 and 4 to 1 to move it 90 degrees clockwise.


Hopefully the next part makes sense?, or you get the idea.
If you want to rotate it by 45 degrees, the mapping has to overlap the borders. The following are guessed values.
1=0.5 ,-0.25
2=1.25 ,0.5
3=0.5 ,1.25
4=-0.25 ,0.5
On the edges where it appears the bitmap will not show. It should wrap around.