/*
================
idBrittleFracture::Fracture_r
================
*/
void idBrittleFracture::Fracture_r( idFixedWinding &w ) {
int i, j, bestPlane;
float a, c, s, dist, bestDist;
idVec3 origin;
idPlane windingPlane, splitPlanes[2];
idMat3 axis, axistemp;
idFixedWinding back;
idTraceModel trm;
idClipModel *clipModel;
while( 1 ) {
origin = w.GetCenter();
w.GetPlane( windingPlane );
if( w.GetArea() < maxShardArea ) {
break;
}
// randomly create a split plane
a = gameLocal.random.RandomFloat() * idMath::TWO_PI;
c = cos( a );
s = -sin( a );
axis[2] = windingPlane.Normal();
axis[2].NormalVectors( axistemp[0], axistemp[1] );
axis[0] = axistemp[ 0 ] * c + axistemp[ 1 ] * s;
axis[1] = axistemp[ 0 ] * s + axistemp[ 1 ] * -c;
// get the best split plane
bestDist = 0.0f;
bestPlane = 0;
for( i = 0; i < 2; i++ ) {
splitPlanes[i].SetNormal( axis[i] );
splitPlanes[i].FitThroughPoint( origin );
for( j = 0; j < w.GetNumPoints(); j++ ) {
dist = splitPlanes[i].Distance( w[j].ToVec3() );
if( dist > bestDist ) {
bestDist = dist;
bestPlane = i;
}
}
}
// split the winding
if( !w.Split( &back, splitPlanes[bestPlane] ) ) {
break;
}
// recursively create shards for the back winding
Fracture_r( back );
}
// translate the winding to it's center
origin = w.GetCenter();
for( j = 0; j < w.GetNumPoints(); j++ ) {
w[j].ToVec3() -= origin;
}
w.RemoveEqualPoints();
trm.SetupPolygon( w );
trm.Shrink( CM_CLIP_EPSILON );
clipModel = new idClipModel( trm );
physicsObj.SetClipModel( clipModel, 1.0f, shards.Num() );
physicsObj.SetOrigin( GetPhysics()->GetOrigin() + origin, shards.Num() );
physicsObj.SetAxis( GetPhysics()->GetAxis(), shards.Num() );
AddShard( clipModel, w );
}
/*
=================
idRenderModelDecal::CreateProjectionInfo
=================
*/
bool idRenderModelDecal::CreateProjectionInfo( decalProjectionInfo_t &info, const idFixedWinding &winding, const idVec3 &projectionOrigin, const bool parallel, const float fadeDepth, const idMaterial *material, const int startTime ) {
if( winding.GetNumPoints() != NUM_DECAL_BOUNDING_PLANES - 2 ) {
common->Printf( "idRenderModelDecal::CreateProjectionInfo: winding must have %d points\n", NUM_DECAL_BOUNDING_PLANES - 2 );
return false;
}
assert( material != NULL );
info.projectionOrigin = projectionOrigin;
info.material = material;
info.parallel = parallel;
info.fadeDepth = fadeDepth;
info.startTime = startTime;
info.force = false;
// get the winding plane and the depth of the projection volume
idPlane windingPlane;
winding.GetPlane( windingPlane );
float depth = windingPlane.Distance( projectionOrigin );
// find the bounds for the projection
winding.GetBounds( info.projectionBounds );
if( parallel ) {
info.projectionBounds.ExpandSelf( depth );
} else {
info.projectionBounds.AddPoint( projectionOrigin );
}
// calculate the world space projection volume bounding planes, positive sides face outside the decal
if( parallel ) {
for( int i = 0; i < winding.GetNumPoints(); i++ ) {
idVec3 edge = winding[( i + 1 ) % winding.GetNumPoints()].ToVec3() - winding[i].ToVec3();
info.boundingPlanes[i].Normal().Cross( windingPlane.Normal(), edge );
info.boundingPlanes[i].Normalize();
info.boundingPlanes[i].FitThroughPoint( winding[i].ToVec3() );
}
} else {
for( int i = 0; i < winding.GetNumPoints(); i++ ) {
info.boundingPlanes[i].FromPoints( projectionOrigin, winding[i].ToVec3(), winding[( i + 1 ) % winding.GetNumPoints()].ToVec3() );
}
}
info.boundingPlanes[NUM_DECAL_BOUNDING_PLANES - 2] = windingPlane;
info.boundingPlanes[NUM_DECAL_BOUNDING_PLANES - 2][3] -= depth;
info.boundingPlanes[NUM_DECAL_BOUNDING_PLANES - 1] = -windingPlane;
// fades will be from these plane
info.fadePlanes[0] = windingPlane;
info.fadePlanes[0][3] -= fadeDepth;
info.fadePlanes[1] = -windingPlane;
info.fadePlanes[1][3] += depth - fadeDepth;
// calculate the texture vectors for the winding
float len, texArea, inva;
idVec3 temp;
idVec5 d0, d1;
const idVec5 &a = winding[0];
const idVec5 &b = winding[1];
const idVec5 &c = winding[2];
d0 = b.ToVec3() - a.ToVec3();
d0.s = b.s - a.s;
d0.t = b.t - a.t;
d1 = c.ToVec3() - a.ToVec3();
d1.s = c.s - a.s;
d1.t = c.t - a.t;
texArea = ( d0[3] * d1[4] ) - ( d0[4] * d1[3] );
inva = 1.0f / texArea;
temp[0] = ( d0[0] * d1[4] - d0[4] * d1[0] ) * inva;
temp[1] = ( d0[1] * d1[4] - d0[4] * d1[1] ) * inva;
temp[2] = ( d0[2] * d1[4] - d0[4] * d1[2] ) * inva;
len = temp.Normalize();
info.textureAxis[0].Normal() = temp * ( 1.0f / len );
info.textureAxis[0][3] = winding[0].s - ( winding[0].ToVec3() * info.textureAxis[0].Normal() );
temp[0] = ( d0[3] * d1[0] - d0[0] * d1[3] ) * inva;
temp[1] = ( d0[3] * d1[1] - d0[1] * d1[3] ) * inva;
temp[2] = ( d0[3] * d1[2] - d0[2] * d1[3] ) * inva;
len = temp.Normalize();
info.textureAxis[1].Normal() = temp * ( 1.0f / len );
info.textureAxis[1][3] = winding[0].t - ( winding[0].ToVec3() * info.textureAxis[1].Normal() );
return true;
}