Particles motion blur

[Bertjenkins]

Hi, all the particles i render in pheonix FD for maya seem to have no motion blur. I've played around with all the settings in the foam and source sections and have not seemed to render one single particle based sim with any motion blur on it. What am i doing wrong? Particle points are pretty useless without moblur

My hunch is that I should be able to see my particle system on the 'output particles' list and apply velocity to it. But the list only contains 'liquid/splashes/mist/foam/wetmap' and not my particle system, in the same way it is listed in the preview tab. I can render the particles in vray with shadows but motion blur makes no difference- or does weird things with straight lines.


Thanks in advance for any help on this!

[Bertjenkins]

And yes, the sim does have velocity applied.

[Bertjenkins]

Also I've noticed on max you have 'refractive index' and 'velocity multiplier'. They don't seem to exist in Maya. From what I've seen in tutorials these make a lot of difference to the motion blur look. Although so far any motion blur would be a bonus!

[Bertjenkins]

It's possible to get correct motion blur if you click 'create particle system' which converts tthe particles to nparticles. But then each time you convert you have to convert a whole new nucleus system, and you don't seem to be able to adjust particle size or anything. It definitely feels like my particles are not connected to the velocity channel correctly.

[Bertjenkins]

If you turn up motion velocity to 100 you get completely wrong velocity. Just weird straight lines. I think the foam shader definitely doesn't seem to be reading the velocity correctly.

[Svetlin.Nikolov]

Hey,

I don't have my work PC in front of me right now, but the Particle Shader in Maya also has Refraction Index and motion blur multiplier. From what I understand you are rendering Drag particles (not any of the liquid particle types), is this correct? They should be named "Particles of ...(the object that emitted them)". If that is the case, Drag particles don't have their own velocity - they use the velocity from the voxel grid, so you should have that exported. If you get streaks, this sounds like you are rendering in Point mode. Just to make sure we know where to look - what renders if you temporarily switch to any other mode - bubble for example - and render a single frame? Would it look similar to the streaks you got - e.g. if there was a specific streak you can see in Point mode, does it create a motion blurred bubble in Bubble mode?

Another test that would help figure it out would be - if you create an Ink preset from the Phoenix shelf and enable the Grid Velocity output, does it still not render moblur correctly?

Cheers!

[Bertjenkins]

Thanks, i was following a max tutorial and those two values are in different places in maya- found them! I followed your example and tried those presets. the motion blur works. ... the reason it wasn't working on my previous points set up was the only way to see the motion blur was to set the motion blur steps extremely low.. to 0.01 or something. Then it starts to come to life. However the look does still seem a little weird....it seems to look better when you convert them to nparticles, and they seem a lot faster to work with. But i find it very tricky to adjust the nparticle node as nothing seems to affect it. Is there a way to get more control over the particle look? can you assign the particle shader to it or something? or is it just that i'm using point mode...

[georgi.zhekov]

With the point mode you have quite a lot of control - you can control the alpha, the shadows, the motion blur step, you can also remap the color based on velocity and age.
We still need to implement animation controls for the opacity though. What is that you are missing?