Developer technologies | Windows Presentation Foundation
A part of the .NET Framework that provides a unified programming model for building line-of-business desktop applications on Windows.
Weird rendering using a Viewport3D control
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(224.00000000000003, 23%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDL%3C/text%3E%3C/svg%3E)
Dirk Langer
0
Reputation points
Hello.
I'm using a Viewport3D control to display a scene that is based on STL files. Some geometries are not rendered properly. Some areas of the surface are looking like no material is applied and you can see the triangles described by the mesh.
So is this a problem of the Viewport3D control or am i doing something wrong?
Thanks in advance
Developer technologies | Windows Presentation Foundation
{count} votes
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Viorel 125.7K Reputation points2023-08-11T07:32:07.2966667+00:00 Did you check the file with other viewers or programs?
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Dirk Langer 0 Reputation points
2023-08-11T08:02:01.0366667+00:00 Yes. Before using the Viewport3D control i used a OpenGL control to display the model and everything looked fine. I only changed to the Viewport3D control because the OpenGL control is Windows Forms based and my application needs AllowsTransparency=True.
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Viorel 125.7K Reputation points
2023-08-11T08:12:26.26+00:00 Did you observe the same things if AllowsTransparency is False?
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Dirk Langer 0 Reputation points
2023-08-11T08:32:07.1033333+00:00 I tried but it makes no difference.
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Dirk Langer 0 Reputation points
2023-08-11T12:35:10.3866667+00:00 I solved the problem. It was a mistake in my code. I did only add one normal vector for each triangle but it must be three (one for each vertex).
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