forums.ps2dev.org

Brunni · Joined: 08 Oct 2005 Posts: 186

I have a very strange problem, while in 2D it works fine, in 3D if I use 16 bits vertices nothing will be drawn :(
Has anyone had this issue? Thanks.
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Sorry for my bad english

Oldschool library for PSP - PC version released

chp · Joined: 23 Jun 2004 Posts: 313

When you use 3D transforms and 16-bit (or 8-bit) vertices, they are normalized to [-1..1] which means that you'd have to transform them to their original size and pivot using the model-transform.
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GE Dominator

Brunni · Joined: 08 Oct 2005 Posts: 186

Err... okay thanks :) But I'm a completely beginner in 3D, could you explain me how can I do that please?
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Sorry for my bad english

Oldschool library for PSP - PC version released

chp · Joined: 23 Jun 2004 Posts: 313

You first find the scale value for each axis (measure the distance between the lowest and highest coordinate), and then figure out a good center so that you can use as much of the resolution between -1 and 1 (-32768 - 32767). You then store these values so that you can construct a matrix that translates & scales your model into the proper location & size. Translate & divide the model down so that it fits within this area.

When rendering you push the matrix on the model-stack the first thing you do and the rest should work.

If you can't follow this, I recommend you research matrices or stick to 32-bit coordinates. :)
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GE Dominator

McZonk · Joined: 14 Jul 2005 Posts: 35 Location: Germany

I have written a sample that show the behavior of integer drawing in 3d mode.
http://svn.ps2dev.org/filedetails.php?repname=psp&path=%2Ftrunk%2Fpspsdk%2Fsrc%2Fsamples%2Fgu%2Fintegerdrawing%2Fintegerdrawing.c&rev=0&sc=0
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http://emergencyexit.untergrund.net - Quake 2 PSP

J.F. · Joined: 22 Feb 2004 Posts: 2906

Well, well... are you adding 3D to OldSchool, Brunni? That would be a nice addition. :)