1 files changed, 52 insertions, 0 deletions
diff --git a/q3map/brush_primit.c b/q3map/brush_primit.c
new file mode 100755
index 0000000..5ec44cc
--- /dev/null
+++ b/q3map/brush_primit.c
@@ -0,0 +1,52 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Quake III Arena source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Foobar; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+#include "qbsp.h"
+
+
+// global flag
+int	g_bBrushPrimit;
+
+// NOTE : ComputeAxisBase here and in editor code must always BE THE SAME !
+// WARNING : special case behaviour of atan2(y,x) <-> atan(y/x) might not be the same everywhere when x == 0
+// rotation by (0,RotY,RotZ) assigns X to normal
+void ComputeAxisBase(vec3_t normal,vec3_t texX,vec3_t texY)
+{
+	vec_t RotY,RotZ;
+	// do some cleaning
+	if (fabs(normal[0])<1e-6)
+		normal[0]=0.0f;
+	if (fabs(normal[1])<1e-6)
+		normal[1]=0.0f;
+	if (fabs(normal[2])<1e-6)
+		normal[2]=0.0f;
+	// compute the two rotations around Y and Z to rotate X to normal
+	RotY=-atan2(normal[2],sqrt(normal[1]*normal[1]+normal[0]*normal[0]));
+	RotZ=atan2(normal[1],normal[0]);
+	// rotate (0,1,0) and (0,0,1) to compute texX and texY
+	texX[0]=-sin(RotZ);
+	texX[1]=cos(RotZ);
+	texX[2]=0;
+	// the texY vector is along -Z ( T texture coorinates axis )
+	texY[0]=-sin(RotY)*cos(RotZ);
+	texY[1]=-sin(RotY)*sin(RotZ);
+	texY[2]=-cos(RotY);
+}