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gr8dane · Joined: 18 Aug 2005 Posts: 16

I seem to be having a problem when using GU_TRANSFORM_2D to do my 2D polygons.

The polygons draw just fine but they always appear behind any 3D objects that I draw. I have tried feeding the 2D polygons various Z values in the vertices. I would assume that giving it a Z value slightly higher than my near clipping plane would do the trick... but no...

Any help here would be appreciated.. Thanks in advance.

ector · Joined: 12 May 2005 Posts: 195

Turn off depth test and draw your 2D stuff last?
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gr8dane · Joined: 18 Aug 2005 Posts: 16

yeah, that would be an option but that should not be needed at all. I should be able to do this without mucking with the Z-buffer state.

gr8dane · Joined: 18 Aug 2005 Posts: 16

I found the answer to my own question so I guess I'll post it here in case anybody else wanted to know.

It seems that when using GU_TRANSFORM_2D nothing is done to any of the vertice values, including the Z value. This makes you unable to just specify a Z value like you would for a 3D object.

Instead you have to pass in values compatible with whatever you have set your depth range to.

For example, if you have something like this in your code:

sceGuDepthRange(0xc350,0x2710);

You would need to set your 2D vertices Z values to a range between 0xc350 - 0x2710. So if you want your 2D polygons to appear in front of everything else make your Z values 0xc350.