quick&dirty nonsolid coloring

diff --git a/src/engine/renderer/tr_shader.cpp b/src/engine/renderer/tr_shader.cpp
index 5c31668ab..7f4d8149a 100644
--- a/src/engine/renderer/tr_shader.cpp
+++ b/src/engine/renderer/tr_shader.cpp
@@ -5180,6 +5180,15 @@ static void FinishStages()
            continue;
        }

+       if ( stage->type == stageType_t::ST_DIFFUSEMAP || stage->type == stageType_t::ST_COLLAPSE_DIFFUSEMAP )
+       {
+           if ( !( ( shader.contentFlags & CONTENTS_SOLID ) || !( shader.surfaceFlags & SURF_NONSOLID ) ) )
+           {
+               stage->bundle[ TB_COLORMAP ].image[ 0 ] = tr.flatImage;
+               stage->type = stageType_t::ST_COLORMAP;
+           }
+       }
+
        switch ( stage->type )
        {
            case stageType_t::ST_REFRACTIONMAP: