particle creation according to texture

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  02 February 2006
particle creation according to texture

hi! everyone. i need a little help. ill try to explain it the best i can. i need to create particles using a texture map. create not emit. picture this. i have a texture map, black background with white polkadots. now i want to create particles on the white part of that map. i dont think emit from surface would work. cuz i only want to place one particle per dot. i cant use a particle grid because my polkadots are not equally spaced. its like spread out everywhere. i need this because im going to instance objects on those particles. and those objects have different shapes and sizes. and im talking massvie amounts of partilces. so i dont want to plant each particle.

if you get what im trying to achieve. please help me. or if you think of another approach. i surely would appreciate it you would share it with us.

thanks. good day!!!
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  02 February 2006
How many dots do you have?
You could use the particle tool to draw 1 particle in the middle of each dot...
I don't think there's any easy way to emit one particle where there's a different colored dot on your texture, let alone the center of that dot.
Do you have to use this texture in particlular? Is it something you could re-create procedurally?
You could create a polka-dot field by creating a surface emitting particle system on a plane, then instancing revolved circle objects where all the particles are. That would give you the center locations of all your polka-dots. That would be a lot simpler than trying to find the center of each dot in an image...

~Mike D.
 
  02 February 2006
there are a few image samplers out there some of them free...but what you are trying to achieve sounds impossible to me...
even if you'd sample that image an use it, i don't think you can instruct maya to emit 'just' 1 particle ... you'd have to, maybe, draw just 1 pixel in that image that gets sampled and that way you'd get the desired particle...
i'm hoping at least to hear from some dynamics guru's who are listening in... if they know this to be possible then please tell us ..
 
  02 February 2006
well its the only way i can think of as of the moment to get the simulation i need. imagine this. i need thousands of parked spaceships. and those ships have different shapes and sizes. if i use a particle grid chances are larger ships would intersect my smaller ships or large ships intersect large ships. thats what im trying to achieve.
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  02 February 2006
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