Strands do not move with Mesh during rendering

 
 
 
Posted by:FlyvisionMedia
Data created:5 September 2019

Hi there,

I'm having problems rendering my strands. I've created a setup with several propagations on a mesh, which is skin wrapped to the main render mesh of a character which is an alembic cache.

In the viewport everything looks fine, the strands move with the object. When I'm rendering a single frame, the strands are also in the right position and move along with the mesh.

If I'm rendering a sequence though, the strands just stay in place, while the rest of the character moves.

Can anyone help me?

I've also attached a screenshot of the stack.

Thank you :)
Marco

Hey again. After trying different things I found that this might be a bug.
Everything works fine, UNTIL I'm adding the first propagation layer. The Strands are not movieng along with the geometry anymore.

Is there anything we can do to fix this?

Thank you :)

Hello Marco,

 

I have not been able to reproduce this. Can you please upload a screenshot of your modifier stack? Also, let me know your 3ds max version and renderer. 

Jeordanis Figuereo (Product Designer. EPHERE Inc.)

Hello Jeordanis,

thank you for taking care of this :) I've uplodaded you the needed files. The main scene is "s050_ME_v001" the alembic cache is referenced in that scene. The hair setup is in the "Hildegard_Hair" scene. My goal was to XRef the Hair into all shots.

If you need anything else let me know.

Here is my version setup:
3DsMax 2020.1 Update
Vray Next, update 2 (4.20.00.00001)
Ornatrix latist stable build (6.2.4.20580)
ABC info: Cache starts with T-Pose @ Frame 979

Thank you!
Marco


Attached Files:

>Hildegard_Hair_ME_v003.max (593920 bytes), >s050_CACHE.abc (24093773 bytes), >s050_ME_v001.max (826870 bytes),

Hi Jeordanis,

here is the screenshot of the stack. In cas you still need it.

Cheers,
Marco


Attached Files:
Image 1

Hi Marco,

Sorry for the delay. Can you please save the test scenes for Max 2019? Also, remember this is a public forum, you may not want to share you fiiles directly. You can send them by email or contact me via FB. 

Jeordanis Figuereo (Product Designer. EPHERE Inc.)

Hi Jeordanis,

I've uploaded you the files and sent them via mail.

Thank you :)
Marco

I wanted to share our solution to this issue, in case someone has to fix this as well.

The problem somehow comes from setting the scalp mesh to "not renderable" in the object properties. Setting it to Renderable but deactivating all the other options, so it is rendering but invisible it seems to work stable.

Another thing we found out is, that the skin wrap works best on vertex mode. I don't think this is for all cases, but working on top of alembic it seems to be the best as option to work with.

 

Hop this helps someone :)