broken water translucency on station15 map

[illwieckz]

See the waterfall and the pond (two different shaders):

Note there is also a problem with depth:

This is a third and similarly broken translucent water shader:

[illwieckz]

For testing purpose a snapshot of for-0.51.0 assets (including station15 map) can be fetched this way:

wget -O- http://gg.illwieckz.net/dl/unvanquished/dev/UnvanquishedAssets.get | xargs wget

[illwieckz]

Here is one example of buggy material:

// Crappy water with leaves
textures/station15_custom/water2
{
	qer_editorImage textures/station15_custom_src/leaves_d
	qer_trans .3
	q3map_globaltexture
	entityMergable
	surfaceparm nobuild
	surfaceparm trans
	surfaceparm water
	surfaceparm nonsolid
	surfaceparm nolightmap
	cull disable
	tesssize 64
	deformVertexes wave 64 sin .8 1.5 2 .8
	{
		map textures/station15_custom_src/water_d
		rgbGen const ( .8 .8 .3 )
		alphaGen const .2
		blendfunc blend
		tcMod scroll .03 .001
	}
	{
		map textures/station15_custom_src/waterfall_r
		alphagen const .3
		blendfunc blend
		rgbGen const ( .8 .9 1 )	// ← this line
		tcmod scale .2 1
		tcGen environment
	}
	{
		map textures/station15_custom_src/leaves_d
		blendfunc blend
		AlphaFunc GE128
		DepthWrite
	}
}

Notice the rgbGen const ( .8 .9 1 ) line I identified.

This is what produces the original material:

This is what produces the same material but with that line commented out (disabled):

This is what produces the same material but with that line moved before the alphagen const .3 line:

I see no difference between without or before. Perhaps we have a bug where alphaGen deletes rgb channels and where rgbGen deletes alpha channel.

[illwieckz]

It looks like we have a fix in #181: