[Plib-cvs] plib/src/ssgAux ssgaParticleSystem.cxx,1.5,1.6 ssgaParticleSystem.h,1.2,1.3

[Steve B. <sj...@us...>]

Update of /cvsroot/plib/plib/src/ssgAux
In directory usw-pr-cvs1:/tmp/cvs-serv11522/plib/src/ssgAux

Modified Files:
	ssgaParticleSystem.cxx ssgaParticleSystem.h 
Log Message:
Allow setting of each particle's size individually - and
also fix bug to *center* each particle around it's position.


Index: ssgaParticleSystem.cxx
===================================================================
RCS file: /cvsroot/plib/plib/src/ssgAux/ssgaParticleSystem.cxx,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -d -r1.5 -r1.6
--- ssgaParticleSystem.cxx	4 Aug 2002 23:45:31 -0000	1.5
+++ ssgaParticleSystem.cxx	27 Aug 2002 22:29:20 -0000	1.6
@@ -59,7 +59,9 @@
 
 void ssgaParticleSystem::draw_geometry ()
 {
-  sgVec3 xx, xxyy, yy ;
+  sgVec3 nxny, xxny, xxyy, nxyy ;
+
+  float sz = size / 2.0f ;
 
   if ( turn_to_face )
   {
@@ -67,30 +69,41 @@
 
     glGetFloatv ( GL_MODELVIEW_MATRIX, (float *) mat ) ;
 
-    sgSetVec3 ( xx, mat[0][0] * size, mat[1][0] * size, mat[2][0] * size ) ;
-    sgSetVec3 ( yy, mat[0][1] * size, mat[1][1] * size, mat[2][1] * size ) ;
-    sgAddVec3 ( xxyy, xx, yy ) ;
+    sgVec3 xx, yy ;
+
+    sgSetVec3 ( xx, mat[0][0] * sz, mat[1][0] * sz, mat[2][0] * sz ) ;
+    sgSetVec3 ( yy, mat[0][1] * sz, mat[1][1] * sz, mat[2][1] * sz ) ;
+
+    sgSetVec3 ( nxny, -xx[0]+yy[0], -xx[1]+yy[1], -xx[2]+yy[2] ) ;
+    sgSetVec3 ( nxyy, -xx[0]-yy[0], -xx[1]-yy[1], -xx[2]-yy[2] ) ;
+    sgSetVec3 ( xxny,  xx[0]-yy[0],  xx[1]-yy[1],  xx[2]-yy[2] ) ;
+    sgSetVec3 ( xxyy,  xx[0]+yy[0],  xx[1]+yy[1],  xx[2]+yy[2] ) ;
   }
   else
   {
-    sgSetVec3 (  xx , size, 0,  0   ) ;
-    sgSetVec3 (  yy ,  0  , 0, size ) ;
-    sgSetVec3 ( xxyy, size, 0, size ) ;
+    sgSetVec3 ( xxny ,  sz, 0, -sz ) ;
+    sgSetVec3 ( nxny , -sz, 0, -sz ) ;
+    sgSetVec3 ( nxyy , -sz, 0,  sz ) ;
+    sgSetVec3 ( xxyy,   sz, 0,  sz ) ;
   }
 
   int j = 0 ;
 
   for ( int i = 0 ; i < num_particles ; i++, j += 4 )
   {
-    sgCopyVec4  ( getColour ( j + 0 ), particle[i].col ) ;
-    sgCopyVec4  ( getColour ( j + 1 ), particle[i].col ) ;
-    sgCopyVec4  ( getColour ( j + 2 ), particle[i].col ) ;
-    sgCopyVec4  ( getColour ( j + 3 ), particle[i].col ) ;
+    sgCopyVec4 ( getColour ( j + 0 ), particle[i].col ) ;
+    sgCopyVec4 ( getColour ( j + 1 ), particle[i].col ) ;
+    sgCopyVec4 ( getColour ( j + 2 ), particle[i].col ) ;
+    sgCopyVec4 ( getColour ( j + 3 ), particle[i].col ) ;
 
-    sgCopyVec3 ( getVertex ( j + 0 ), particle[i].pos ) ;
-    sgAddVec3  ( getVertex ( j + 1 ), particle[i].pos, xx ) ;
-    sgAddVec3  ( getVertex ( j + 2 ), particle[i].pos, xxyy ) ;
-    sgAddVec3  ( getVertex ( j + 3 ), particle[i].pos, yy ) ;
+    sgAddScaledVec3 ( getVertex ( j + 0 ), particle[i].pos,
+                                     nxny, particle[i].size ) ;
+    sgAddScaledVec3 ( getVertex ( j + 1 ), particle[i].pos,
+                                     xxny, particle[i].size ) ;
+    sgAddScaledVec3 ( getVertex ( j + 2 ), particle[i].pos,
+                                     xxyy, particle[i].size ) ;
+    sgAddScaledVec3 ( getVertex ( j + 3 ), particle[i].pos,
+                                     nxyy, particle[i].size ) ;
   }
 
   glDisable   ( GL_CULL_FACE ) ;

Index: ssgaParticleSystem.h
===================================================================
RCS file: /cvsroot/plib/plib/src/ssgAux/ssgaParticleSystem.h,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -d -r1.2 -r1.3
--- ssgaParticleSystem.h	19 Jan 2002 20:37:21 -0000	1.2
+++ ssgaParticleSystem.h	27 Aug 2002 22:29:20 -0000	1.3
@@ -8,6 +8,8 @@
   sgVec3 vel ;
   sgVec3 acc ;
 
+  float size ;
+
   float time_to_live ;
   void *userData ;
 
@@ -26,6 +28,7 @@
     sgZeroVec3 ( acc ) ;
     time_to_live = 0 ;
     userData = NULL ;
+    size = 1.0f ;
   } 
 
 } ;