[Solved] Animation and still image rendering differ Tweet

[davorin]

Hello

I am trying some fluid dynamics inside blender...

But when I compare the rendering from a specific time with the animation the look is totally different:

Still image from fluid simulation:

And this is a screen shot from the animation:

Both images are taken at frame 60.


Rendering the animation in Cycles looks correct like the still image.

Constant crashing during rendering is another thing (o;

[davorin]

Really weird...first two frames are correct, then the water material gets dark and stays that way...

Frame 0:

Frame 1:

Frame 2:

[davorin]

Interesting to note....

when Cycles and Octane are both set to 200 samples limit, Cycles with CUDA using a GTX1060 6GB on Linux is way faster than Octane with a GTX1080 TI running on macOS.

Octane GTX1080 TI:

Code: Select all

Append frame 90
 Time: 00:31.05 (Saving: 00:00.01)


Cycles GTX1060

Code: Select all

Append frame 90
 Time: 00:08.06 (Saving: 00:00.01)


[davorin]

Wrong animation rendering with Octane for Blender:

https://youtu.be/L51M3ASxoAc

Correct rendering of animation with Cycles:

https://youtu.be/Pn_uVDM4H3E


It looks to me like OctaneRender always uses the maximum mesh extent of the fluid
and doesn't take into account newer smaller mesh dimensions.

[davorin]

Okay...got it....seems the Flip Fluids demo plugin doesn't auto-detect Octane as the commercial version does...

So you need to set the Mesh to "global" for the fluid...

But black frames in animation rendering still persist...

[Rik56]

really strange, I am using flip fluids with octane and have never seen this. Isn't there some rogue keyframe in your node editor?

edit: Some of the frames are rendering black, i've seen this with octane 4 version, which one are you using?

[davorin]

Switched back to 3.08....no problems then (o;

[linograndiotoy]

I'll check FLIP Fluids in Octane 4 again.
Never had issues with the render.