quick/netradiant-custom
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Fix q3 compatibility bug with lightgrid and only one light.

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Correct math requires the ambient component of the lightgrid to be zero
in that case. However, q3 ignores lightgrid cells with all zero ambient
value, EVEN if the directed value is nonzero.

This change sets the ambient value to #010101 if it'd be pitch black. This
should be a minimal change without affecting light hue that fixes
lightgrid rendering. In engines like DarkPlaces, almost no map should
look different from this.

Fixes https://gitlab.com/xonotic/netradiant/-/issues/137
This commit is contained in:
Garux 2020-04-14 19:45:00 +03:00
parent 42ac0ccb61
commit 49b725a1b2
1 changed files with 9 additions and 0 deletions
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9
tools/quake3/q3map2/light.c
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@ -1731,6 +1731,15 @@ void TraceGrid( int num ){
/* vortex: apply gridscale and gridambientscale here */
ColorToBytes( color, bgp->ambient[ i ], gridScale * gridAmbientScale );
ColorToBytes( gp->directed[ i ], bgp->directed[ i ], gridScale );
/*
* HACK: if there's a non-zero directed component, this
* lightgrid cell is useful. However, q3 skips grid
* cells with zero ambient. So let's force ambient to be
* nonzero unless directed is zero too.
*/
if( bgp->ambient[i][0] + bgp->ambient[i][1] + bgp->ambient[i][2] == 0
&& bgp->directed[i][0] + bgp->directed[i][1] + bgp->directed[i][2] != 0 )
VectorSet( bgp->ambient[i], 1, 1, 1 );
}
/* debug code */