[Bf-blender-cvs] [f6dc7a7cf3c] master: Cleanup: code comment for view3d_viewmatrix_set

[Campbell Barton]

Commit: f6dc7a7cf3c8074da008690ea95ddba95ed24c0a
Author: Campbell Barton
Date:   Tue Jan 23 17:36:51 2018 +1100
Branches: master
https://developer.blender.org/rBf6dc7a7cf3c8074da008690ea95ddba95ed24c0a

Cleanup: code comment for view3d_viewmatrix_set

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M	source/blender/editors/space_view3d/view3d_view.c

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diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index e7da9e2a074..bb8279b9877 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -1191,6 +1191,11 @@ void view3d_viewmatrix_set(
 			vec[2] = 0.0f;
 
 			if (rect_scale) {
+				/* Since 'RegionView3D.winmat' has been calculated and this function doesn't take the 'ARegion'
+				 * we don't know about the region size.
+				 * Use 'rect_scale' when drawing a sub-region to apply 2D offset,
+				 * scaled by the difference between the sub-region and the region size.
+				 */
 				vec[0] /= rect_scale[0];
 				vec[1] /= rect_scale[1];
 			}