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Ess
Joined: 20 Apr 2006
Posts: 16
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 Posted: Sun May 07, 2006 5:17 am Post subject: Sample/snippet of how to rotate an image using gu functions? |
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| I'm hoping someone can help me get an image so rotate using gu. Some code snippets or even just the function i'm supposed to use (with parameters, please) would be greatly appreciated. |
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fish
Joined: 08 Feb 2006
Posts: 25
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| Posted: Sun May 07, 2006 8:44 am Post subject: |
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if you're rendering it vertex by vertex, (TRIANGLE_STRIP/TRIANGLE_FAN etc)
sceGumRotateZ(valueInRads);
is what you need, although if you know about vertices you'd probably know about transformation matrices too.
if you're rendering SPRITES on the other hand, basically, you cant, SPRITEs are always screen aligned. |
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PlayfulPuppy
Joined: 05 May 2006
Posts: 22
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| Posted: Sun May 07, 2006 2:56 pm Post subject: |
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| fish wrote: | | if you're rendering SPRITES on the other hand, basically, you cant, SPRITEs are always screen aligned. |
Although you should be able to rotate the image by rotating the texture coordinates via a texture matrix.
However I haven't tried this. |
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CyberBill
Joined: 26 Jul 2005
Posts: 86
Location: Redmond, WA
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| Posted: Mon May 08, 2006 3:27 am Post subject: |
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Rotating texture coordintaes would not give the desired effect...
Edges would be cut off, because the image on the screen is still square at all times.
To make sprites rotate, you need to stop using sprites and start using quads... vertex and matrix time. :) |
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dot_blank
Joined: 28 Sep 2005
Posts: 498
Location: Brasil
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| Posted: Mon May 08, 2006 6:25 am Post subject: |
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just rotate image origin (or create your own
mid point ) around the z axis
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