[g2.2pre-2123] CopyAlpha in TEXTURES: partly not drawn on 3D floors

[boris]

When using a texture defined in TEXTURES on a 3D floor that contains a patch with style CopyAlpha, no pixel is drawn at all if (apparently) the alpha value is in a certain range. It works as expected in ZDoom.

Screenshot:



Example WAD: http://88.198.197.45/boris/doom/copyalpha.wad

[Graf Zahl]

Just one note. This is wrong in both.

GZDoom does not recognize that the texture has an alpha channel and selects an incorrect blend mode and ZDoom simply ignores it. ZDoom can't fix this, though.
Of course I am going to address this but then the texture still won't look like you'd expect because the lower part would be translucent.

The main error is that you used the wrong mode for copying the patch. What you want is 'overlay', not 'copyalpha'.

[boris]

I just noticed that it happens on 2-sided lines, too.

[Guest]

Thanks for the info, works like I want it with "Overlay".

[Graf Zahl]

fixed. Now the textures are being rendered with alpha. This also exposed another problem: Textures with translucency were never checked for on 3D floors and portals.