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On grid lighting, redistribute the 25% of the floodlight as omnidirectional ambient light, and use only the 75% of it as top-down directional light.

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jal 2010-07-11 12:16:08 +02:00
parent 1e42a4f095
commit 6661c1a8e8
1 changed files with 54 additions and 45 deletions
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33
tools/quake3/q3map2/light.c
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@ -1421,6 +1421,7 @@ typedef struct
{ {
vec3_t dir; vec3_t dir;
vec3_t color; vec3_t color;
vec3_t ambient;
int style; int style;
} }
contribution_t; contribution_t;
@ -1514,6 +1515,7 @@ void TraceGrid( int num )
/* add a contribution */ /* add a contribution */
VectorCopy( trace.color, contributions[ numCon ].color ); VectorCopy( trace.color, contributions[ numCon ].color );
VectorCopy( trace.direction, contributions[ numCon ].dir ); VectorCopy( trace.direction, contributions[ numCon ].dir );
VectorClear( contributions[ numCon ].ambient );
contributions[ numCon ].style = trace.light->style; contributions[ numCon ].style = trace.light->style;
numCon++; numCon++;
@ -1535,21 +1537,19 @@ void TraceGrid( int num )
//do our floodlight ambient occlusion loop, and add a single contribution based on the brightest dir //do our floodlight ambient occlusion loop, and add a single contribution based on the brightest dir
if( floodlighty ) if( floodlighty )
{ {
int q; int k;
float addSize, f; float addSize, f;
vec3_t col,dir; vec3_t dir = { 0, 0, 1 };
col[0]=col[1]=col[2]=floodlightIntensity; float ambientFrac = 0.25f;
dir[0]=dir[1]=0;
dir[2]=1;
trace.testOcclusion = qtrue; trace.testOcclusion = qtrue;
trace.forceSunlight = qfalse; trace.forceSunlight = qfalse;
trace.inhibitRadius = DEFAULT_INHIBIT_RADIUS; trace.inhibitRadius = DEFAULT_INHIBIT_RADIUS;
trace.testAll = qtrue; trace.testAll = qtrue;
for (q=0;q<2;q++) for( k = 0; k < 2; k++ )
{ {
if (q==0) //upper hemisphere if( k == 0 ) // upper hemisphere
{ {
trace.normal[0] = 0; trace.normal[0] = 0;
trace.normal[1] = 0; trace.normal[1] = 0;
@ -1564,19 +1564,26 @@ void TraceGrid( int num )
f = FloodLightForSample( &trace, floodlightDistance, floodlight_lowquality ); f = FloodLightForSample( &trace, floodlightDistance, floodlight_lowquality );
contributions[ numCon ].color[0]=col[0]*f; /* add a fraction as pure ambient, half as top-down direction */
contributions[ numCon ].color[1]=col[1]*f; contributions[ numCon ].color[0]= floodlightRGB[0] * floodlightIntensity * f * ( 1.0f - ambientFrac );
contributions[ numCon ].color[2]=col[2]*f; contributions[ numCon ].color[1]= floodlightRGB[1] * floodlightIntensity * f * ( 1.0f - ambientFrac );
contributions[ numCon ].color[2]= floodlightRGB[2] * floodlightIntensity * f * ( 1.0f - ambientFrac );
contributions[ numCon ].ambient[0]= floodlightRGB[0] * floodlightIntensity * f * ambientFrac;
contributions[ numCon ].ambient[1]= floodlightRGB[1] * floodlightIntensity * f * ambientFrac;
contributions[ numCon ].ambient[2]= floodlightRGB[2] * floodlightIntensity * f * ambientFrac;
contributions[ numCon ].dir[0] = dir[0]; contributions[ numCon ].dir[0] = dir[0];
contributions[ numCon ].dir[1] = dir[1]; contributions[ numCon ].dir[1] = dir[1];
contributions[ numCon ].dir[2] = dir[2]; contributions[ numCon ].dir[2] = dir[2];
contributions[ numCon ].style = 0; contributions[ numCon ].style = 0;
numCon++;
/* push average direction around */ /* push average direction around */
addSize = VectorLength( col ); addSize = VectorLength( contributions[ numCon ].color );
VectorMA( gp->dir, addSize, dir, gp->dir ); VectorMA( gp->dir, addSize, dir, gp->dir );
numCon++;
} }
} }
///////////////////// /////////////////////
@ -1632,6 +1639,8 @@ void TraceGrid( int num )
d = 0.25f * (1.0f - d); d = 0.25f * (1.0f - d);
VectorMA( gp->ambient[ j ], d, contributions[ i ].color, gp->ambient[ j ] ); VectorMA( gp->ambient[ j ], d, contributions[ i ].color, gp->ambient[ j ] );
VectorAdd( gp->ambient[ j ], contributions[ i ].ambient, gp->ambient[ j ] );
/* /*
* div0: * div0:
* the total light average = ambient value + 0.25 * sum of all directional values * the total light average = ambient value + 0.25 * sum of all directional values