sudden change in nparticles when rendered out?

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  06 June 2011
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?

http://www.youtube.com/watch?v=poOnLjiPPzw

bit of distortion at the begining, so just ignore that
 
  06 June 2011
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.
 
  06 June 2011
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.
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Vimeo
 
  06 June 2011
i'm using water nparticles and using an emitter with the text set as a goal which has visibility turned off
 
  06 June 2011
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.
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Vimeo
 
  06 June 2011
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.
 
  06 June 2011
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 nparticletest.ma.zip (265.1 KB, 7 views)

Last edited by av23 : 06 June 2011 at 06:42 PM.
 
  06 June 2011
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.
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Vimeo
 
  07 July 2011
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.
 
  07 July 2011
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'.
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Vimeo
 
  07 July 2011
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.
 
  07 July 2011
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