Hello everyone,

I am a beginner in Houdini and currently experimenting with morphing between two different objects using VDB. I would like to ask what is the best way to achieve a morph that happens at specific frames (for example: start, hold for a few seconds, and then shrink).

So far, I have been trying to control this inside a VDB Morph using the timestep parameter with keyframes. Is this the correct approach, or is there a better method?

I also tried to use a Transform node outside the solver to scale the object (start small → grow → shrink), but I noticed something strange: whenever I change the voxel size, the morphing speed slows down. By "slow down" I don’t mean computer performance, but the timing of the morph animation itself.

Does anyone know why this happens, and how I can properly control the morph timing regardless of voxel size? Any advice, tips, or workflow suggestions would be really appreciated.

Thanks in advance!

Here's an old-school method where you provide a merged bounding box encompassing both mesh shapes. This ensures the resolution remains constant. I'm not sure what you mean by "slow down." If you're expecting real-time playback from the viewport, that's not gonna happen. Use MPlay to render the viewport frames, then review your timing in MPlay.

Thank you for your reply and for suggesting the bounding box method, I will definitely give that a try to keep the resolution consistent.

Just to clarify what I meant by "slow down": I wasn’t referring to viewport playback performance. What I noticed is that when I increase the voxel size, the actual morph animation itself (start → hold → shrink) appears to take longer, as if the timing of the transition is being stretched out.