CGTalk - how to query pixel luminance and use value

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j00ey

03-17-2005, 09:37 AM

Hi
I have a grid of objects and i want to drive their y translation by querying the luminance values of an image so that the top left object is driven by the top left pixel etc.
I would have thought this was a fairly common thing to do but i'm not having any luck with google. My MEL is VERY limited but I presume that's the way to do it... or I thought maybe projecting an image onto the objects and using a surfLuminance?
does anyone have any ideas?
thanks
j00ey

joss3D

03-18-2005, 04:30 PM

you may use the colorAtPoint commande

j00ey

03-20-2005, 09:10 AM

Thanks I'll look into it.
Did it manually for now but would really like to know how to use MEL.

Nicool

03-20-2005, 04:51 PM

- If you want a demo of using colorAtPoint, look a mapSpread.mel script here (http://ndhaussy.free.fr/maya_object_spreading_article/)

- I know there exists a shading network method to get pixel color explained in a online tutorial (on a kind of blog site)

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