how to rotate a texture?

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how to rotate a texture? #385027 10/11/11 18:45 10/11/11 18:45
M mercuryus OP Unregistered
mercuryus OP Unregistered M	how can i rotate a texture - like shifting with mtl_uvspeed?

Re: how to rotate a texture? [Re: ] #385030 10/11/11 20:01 10/11/11 20:01
Joined: Oct 2005 Posts: 4,771 Bay City, MI lostclimate Expert
lostclimate Expert Joined: Oct 2005 Posts: 4,771 Bay City, MI	it will require some trig, i wont explain it in full because its a little compilicated but you'd want to look up using sin and cos functions if you look it up (soh cah toa) on google you should be able to find the proper info to figure it out.

Re: how to rotate a texture? [Re: lostclimate] #385031 10/11/11 20:05 10/11/11 20:05
Joined: Jan 2003 Posts: 4,615 Cambridge Joey Expert
Joey Expert Joined: Jan 2003 Posts: 4,615 Cambridge	Code: x' = cos(a)x - sin(a)y y' = sin(a)x + cos(a)y then use that as lookup. You can also create a rotation matrix offline, pass it to your shader and use mul(...), that should be way faster.

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