fix(pointgroup): Let Volume Particles assume default size if no size array is given

Core/Libraries/Source/WWVegas/WW3D2/pointgr.cpp

@@ -1106,6 +1106,13 @@ void PointGroupClass::Update_Arrays(
 
 		case TRIS_SIZE_NOORIENT:
 			{
+				if (!point_size)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				// Scale vertex offsets and add them to point locations to get vertex locations
 				for (i = 0; i < active_points; i++) {
 					vertex_loc[vert + 0] = point_loc[i] +
@@ -1121,6 +1128,13 @@ void PointGroupClass::Update_Arrays(
 
 		case TRIS_NOSIZE_ORIENT:
 			{
+				if (!point_orientation)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				// Scale vertex offsets and add them to point locations to get vertex locations
 				for (i = 0; i < active_points; i++) {
 					vertex_loc[vert + 0] = point_loc[i] +
@@ -1136,6 +1150,13 @@ void PointGroupClass::Update_Arrays(
 
 		case TRIS_SIZE_ORIENT:
 			{
+				if (!point_size || !point_orientation)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				// Scale vertex offsets and add them to point locations to get vertex locations
 				for (i = 0; i < active_points; i++) {
 					vertex_loc[vert + 0] = point_loc[i] +
@@ -1171,6 +1192,13 @@ void PointGroupClass::Update_Arrays(
 
 		case QUADS_SIZE_NOORIENT:
 			{
+				if (!point_size)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				// Scale vertex offsets and add them to point locations to get vertex locations
 				for (i = 0; i < active_points; i++) {
 					vertex_loc[vert + 0] = point_loc[i] +
@@ -1188,6 +1216,13 @@ void PointGroupClass::Update_Arrays(
 
 		case QUADS_NOSIZE_ORIENT:
 			{
+				if (!point_orientation)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				// Scale vertex offsets and add them to point locations to get vertex locations
 				for (i = 0; i < active_points; i++) {
 					vertex_loc[vert + 0] = point_loc[i] +
@@ -1205,6 +1240,13 @@ void PointGroupClass::Update_Arrays(
 
 		case QUADS_SIZE_ORIENT:
 			{
+				if (!point_size || !point_orientation)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				Matrix4x4 view;
 				Vector4 result;
 				if (!Billboard) {
@@ -1312,6 +1354,13 @@ void PointGroupClass::Update_Arrays(
 		case SCREEN_SIZE_NOORIENT:
 		case SCREEN_SIZE_ORIENT:
 			{
+				if (!point_size)
+				{
+					vnum = 0;
+					pnum = 0;
+					return;
+				}
+
 				// Offsets need to be scaled to the current screen resolution
 
    			// First find x and y scale factors (sizes in pixels need to be
@@ -1790,7 +1839,8 @@ void PointGroupClass::RenderVolumeParticle(RenderInfoClass &rinfo, unsigned int
 			// 3 times per particle when we can do it once
 			float recipDepth = 0.1f / (float)depth;
 
-			float shiftInc = ( t *  *current_size * recipDepth );
+			const float pointSize = current_size ? *current_size : DefaultPointSize;
+			float shiftInc = t * pointSize * recipDepth;
 
 			Vector3 volumeLayerShift;
 			Vector3 cameraPosition = rinfo.Camera.Get_Position();