sudden change in nparticles when rendered out?

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Old 06 June 2011   #1
sudden change in nparticles when rendered out?

Just doing a test with small nparticle balls, but when it gets half way through it suddenly changes to more fluid like? any ideas?

bit of distortion at the begining, so just ignore that
Old 06 June 2011   #2
The reason this is happening is simple enough. Imagine nParticle grids are like a fluid bounds. It is calculated as a square bounding box, you are going from a higher resolution to a lower one because the grid size is getting large. Adjust your settings in your mesh output tab to compensate.

One thing i do is to set 8 nParticles at the extreme edges (cube) of my sim, that way maya will always calculate the same bounds no matter if the sim is happening in a smaller area or at its final position. Then just set the nPartcile radius of those 8 particles to zero.

good luck.
Old 06 June 2011   #3
Im not sure he intends using the iso-mesh, are you sure you are not using blobbies? Maybe you need to post a scene, it looks pretty odd more of a bug.
Old 06 June 2011   #4
i'm using water nparticles and using an emitter with the text set as a goal which has visibility turned off
Old 06 June 2011   #5
it looks like you need to play with your radius and threshold values, prob increase both values. Both seem too low and therefore your sim is requiring a ton of particles before the metaball effect kicks in which you see happens half way through your sim.
Old 06 June 2011   #6
It looks to me more like what Michael described. He is probably converting particle to poly, not using the native particle blobby raytrace. As such his triangle size is probably quite small relative to the text size. As the bounds of the region gets larger the max grid size is exceeded and the triangles get larger and smoother. If a single particle suddenly shot away from the text it could explain why the jump happened so suddenly.

If this is the case then make sure all the particles stay within a close region. Either increase the triangle size or the maxTriangleResolution. Also it might help to increase the blobby radius scale, depending on the desired effect.
Old 06 June 2011   #7
here is the file if your interested. i really like the effect at the begining kind of looks a bit like stop motion, but don't like it when it becomes more fluidic
Attached Files
File Type: zip (265.1 KB, 7 views)

Last edited by av23 : 06 June 2011 at 06:42 PM.
Old 06 June 2011   #8
Okay so you are using the isomesh then the above comments would apply, although the particle distribution on your file looks different from the one in your video for some reason. If you dont like the liquid effect I would delete the isomesh and just work with particles.
Old 07 July 2011   #9
yeah, changed it slightly. What i originally wanted was a drop to fall splash and then form the logo, couldn't get it to work so gave up on that and found i quite liked this effect. Will they render without converting to polygon mesh? also is it possible to revert back to particles when youve converted to polygon mesh and saved? or would i need to make them again?

Last edited by av23 : 07 July 2011 at 01:07 PM.
Old 07 July 2011   #10
Yep, they are only blobby particles. You can delete the meshShape nodes and under the display tab on your particle shape, turn off 'intermediate object'.
Old 07 July 2011   #11
Thanks a lot! just curious how would you go about making a drop splash and then form the logo? as the particles are all attracted to one side of the logo, is there a way to make them distribute evenly?

Last edited by av23 : 07 July 2011 at 09:32 AM.
Old 07 July 2011   #12
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