(03-04-2025, 05:09 AM)fruqanhamid  I don't know what I'm doing wrong. I've set up a simple test with an IFL sequence using TYbitmap. I've got a custom float using particle age and I can see the UVW values are different on each particle. Yet they are still all in sync from the IFL 0 frame.  I've attached my test file would greatly appreciate any help figuring out what I'm doing wrong. I feel like I'm being an idiot and missing something simple. But just cannot get it to behave like i need it to. Wrote:

(02-28-2025, 09:13 PM)Sputnikanimation Wrote: Hello,   

 I have a particle system with spheres that all have the same animated bitmap sequence on them. Right now they are all playing in sync and I want to randomize their starting point so they are all different. 

 I have found several threads on this but none of them have a solution or tutorial on how to do this. 

 I've looked at the UVW_gradient sample file and can't seem to get it to work with TY-bitmap IFL frames versus the gradient. 

 I'm not sure what I'm missing. If anyone knows of a tutorial or resource for this I would appreciate the help. 

Thank you for your time, 
 James

You can randomize the start frame of the animated bitmap using a Mapping operator with a UVW Offset in tyFlow. Try enabling "Use Particle Age" and adjusting the offset with a random variation. Also, check the tyBitmap IFL frame mode to ensure it's set correctly.

(02-28-2025, 09:13 PM)Ok I'm trying to render this out in Arnold and it seems like it's not working in Arnold. When I try out the Gradient tutorial file it works fine in scanline, but breaks when I try to render it out in Arnold. Is Arnold not compatible with mapping out particles by age or UVW.x? Thanks for your help, Sputnikanimation Wrote: Hello,   

 I have a particle system with spheres that all have the same animated bitmap sequence on them. Right now they are all playing in sync and I want to randomize their starting point so they are all different. 

 I have found several threads on this but none of them have a solution or tutorial on how to do this. 

 I've looked at the UVW_gradient sample file and can't seem to get it to work with TY-bitmap IFL frames versus the gradient. 

 I'm not sure what I'm missing. If anyone knows of a tutorial or resource for this I would appreciate the help. 

Thank you for your time, 
 James