Index: trunk/psModules/src/objects/pmSourceVisual.c
===================================================================
--- trunk/psModules/src/objects/pmSourceVisual.c	(revision 20582)
+++ trunk/psModules/src/objects/pmSourceVisual.c	(revision 21183)
@@ -57,5 +57,5 @@
 	model->data.F32[i] = pmTrend2DEval (trend, x->data.F32[i], y->data.F32[i]);
 	resid->data.F32[i] = param->data.F32[i] - model->data.F32[i];
-	if (mask->data.U8[i]) continue;
+	if (mask->data.PS_TYPE_VECTOR_MASK_DATA[i]) continue;
 	min = PS_MIN (min, resid->data.F32[i]);
 	max = PS_MAX (max, resid->data.F32[i]);