- fixed another oldie... displaylists for MBall was generated FAR too often.

even for each redraw! Now its all smooth & fast again.

  introduced new kernel API call: int is_basis_mball(ob), this provides a
  quick check of the object is the actual basis for the displaylist and
  polygonization.

source/blender/blenkernel/BKE_mball.h

@@ -52,6 +52,7 @@ void make_local_mball(struct MetaBall *mb);
 void tex_space_mball( struct Object *ob);
 void make_orco_mball( struct Object *ob);
 struct Object *find_basis_mball( struct Object *ob);
+int is_basis_mball(struct Object *ob);
 void metaball_polygonize(struct Object *ob);
 void calc_mballco(struct MetaElem *ml, float *vec);
 float densfunc(struct MetaElem *ball, float x, float y, float z);

source/blender/blenkernel/intern/displist.c

@@ -1488,6 +1488,7 @@ void makeDispList(Object *ob)
 		}
 	}
 	else if(ob->type==OB_MBALL) {
+		
 		ob= find_basis_mball(ob);
 
 		metaball_polygonize(ob);

source/blender/blenkernel/intern/mball.c

@@ -265,6 +265,15 @@ void make_orco_mball(Object *ob)
 	}
 }
 
+int is_basis_mball(Object *ob)
+{
+	int len;
+	
+	/* just a quick test */
+	len= strlen(ob->id.name);
+	if( isdigit(ob->id.name[len-1]) ) return 0;
+	return 1;
+}
 
 Object *find_basis_mball(Object *basis)
 {

source/blender/src/drawobject.c

@@ -77,6 +77,7 @@
 #include "BKE_global.h"
 #include "BKE_displist.h"
 #include "BKE_material.h"
+#include "BKE_mball.h"
 #include "BKE_ipo.h"
 #include "BKE_mesh.h"
 #include "BKE_effect.h"
@@ -2196,6 +2197,7 @@ static void drawDispList(Object *ob, int dt)
 		break;
 	case OB_MBALL:
 		
+		if( is_basis_mball(ob)) {
 			lb= &ob->disp;
 			if(lb->first==0) makeDispList(ob);
 	
@@ -2214,6 +2216,7 @@ static void drawDispList(Object *ob, int dt)
 				}
 			}
 			else drawDispListwire(lb);
+		}
 		break;
 	}