Particle system trees boundaries

[Anonymous]

I followed this tutorial and it was straight forward enough to create particle system trees and should work well for a large area:

https://knowledge.autodesk.com/support/3ds-max/getting-started/caas/CloudHelp/cloudhelp/2017/ENU/3DS...

However I am curious if anyone knows a way to limit the boundaries of the particle system layout using a closed spline? 

Thanks 

[10DSpace · Accepted solution]

@Anonymous 

I don't know about using a closed spline, but if you are trying to confine the emitted particles to a specific area (ie., boundaries) of the Position Object or in your scene, there are multiple ways to do it from within the Position Object:

1. Create specific shaped object(s) that define the area(s) you want to confine the emission to then add these to the list of emitter Objects in the Position Object Rollout.

2. Create an editable poly surface as your Emitter Object and under  "Location"  in the Position Object Rollout, choose "Selected Faces".   Now the emitted particle will be confined to the faces/Polygons you select.

3. Check "Density by Material and then select, greyscale, opacity or any of the other options that allow you to use a texture map to define the areas of interest on the emitter object. 

You can combine the above techniques as well.  Here is a link to the docs on the Position object options. 

https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMa...

Hope this helps.

[lynn_zhang]

Hello @Anonymous ,

Have you got the chance to try the above suggestions from @10DSpace ? Did any of these work for you? If you find the suggestions helpful, please click on the "Accept as Solution" button in his reply so this helps other users in the community find the solution too. Thanks!