Holance

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Interesting, are you hooking up a lot of events to track meshes?

Usually memory leaks are caused by event handlers not being cleaned.

Unfortunately there's no newer version of assimp net available.

Could you provide a stp file so we can do some test on it?

Obviously assimp does not fully support step file: https://github.com/assimp/assimp/issues/2000

You probably can try to use different importer like https://github.com/ixmilia/step and then convert to helixtoolkit components.

Try to disable dx 2d by setting Viewport3DX.EnableD2DRendering = false.

https://github.com/helix-toolkit/helix-toolkit/tree/develop/Source/Examples/WPF.SharpDX/CustomViewCubeDemo

If you want to do it with vertex shader, you have to heavily customize Helix toolkit source code.