Merge pull request opencv#10839 from csukuangfj:fix-9486

alalek · alalek · commit ab0f0f26a1d8 · 2018-02-12T09:24:29.000Z
diff --git a/modules/viz/src/widget.cpp b/modules/viz/src/widget.cpp
@@ -286,6 +286,10 @@ cv::Affine3d cv::viz::Widget3D::getPose() const
 {
     vtkProp3D *actor = vtkProp3D::SafeDownCast(WidgetAccessor::getProp(*this));
     CV_Assert("Widget is not 3D." && actor);
+    if (!actor->GetUserMatrix())
+    {
+        return Affine3d(); // empty user matrix, return an identity transform.
+    }
     return Affine3d(*actor->GetUserMatrix()->Element);
 }
 

Original file line number	Diff line number	Diff line change
`@@ -286,6 +286,10 @@ cv::Affine3d cv::viz::Widget3D::getPose() const`
`286`	`286`	`{`
`287`	`287`	`vtkProp3D actor = vtkProp3D::SafeDownCast(WidgetAccessor::getProp(this));`
`288`	`288`	`CV_Assert("Widget is not 3D." && actor);`
	`289`	`+ if (!actor->GetUserMatrix())`
	`290`	`+ {`
	`291`	`+ return Affine3d(); // empty user matrix, return an identity transform.`
	`292`	`+ }`
`289`	`293`	`return Affine3d(*actor->GetUserMatrix()->Element);`
`290`	`294`	`}`
`291`	`295`