Depending on your GPU configuration, you may experience viewport display artifacts when using Vulkan as your graphics API. These issues typically manifest as curves being randomly stretched or distorted in the viewport, even when your mesh setup is correct (non-overlapping UVs, proper topology, etc.).
Symptoms
Curves appear randomly stretched or destroyed in the viewport
Visual display artifacts
Mesh deformation in viewport despite correct UV layout
Solution
If you encounter these issues, switch from Vulkan to OpenGL in Houdini's display settings:
Go to Edit > Preferences > 3D Viewports
Change the Renderer from Vulkan to OpenGL
Restart Houdini for changes to take effect
Important Note:
Switching to OpenGL will result in the loss of certain viewport feedback features introduced in Houdini 20.5+, including:
Enhanced COPs (Compositing Operators) viewport feedback
Other Vulkan-dependent viewport display features
We recommend testing both APIs to determine which provides the best balance of viewport stability and features for your specific hardware configuration.