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The Official Reality forums • alpha or opacity map
Page 1 of 1

alpha or opacity map

Posted: Thu Aug 08, 2019 10:44 am
by KrollMoll
Hello everybody,

Does anyone know where I could find a good tutorial to create alpha or transparency map for rendering hairs...

Thanks in advance.

Re: alpha or opacity map

Posted: Thu Aug 08, 2019 5:43 pm
by PlatnumK
Not sure if this is any good

Re: alpha or opacity map

Posted: Fri Aug 09, 2019 4:20 am
by KrollMoll
Thanks for this verry interesting and usefull link but what I would like to know is the way to CREATE a alpha or transparency map...

Any idea?

Re: alpha or opacity map

Posted: Mon Aug 12, 2019 5:41 am
by Marcel2586
a transparency map or alpha map exist 9 out of 10 times out of two colors, black and white.
The black makes sure that the part is invisible and the white is visible. A nice example is leaves of trees.
It is almost impossible to model all the leaves and there comes transparency maps or alpha maps in handy.
The leaves are small square planes with a leave texture on it and with a transparency map.

cgaxis_models_95_45_02_opacity.jpg

The transparency map


cgaxis_models_95_45_02.jpg

the texture map

You can trace a texture map in a paint program and make it white and the rest black.

Re: alpha or opacity map

Posted: Tue Aug 13, 2019 4:49 am
by KrollMoll
It means all hairs transparency maps have been ceated by hand?
There is no possibilities to generate it with a program as for bump maps?

Re: alpha or opacity map

Posted: Wed Aug 14, 2019 6:38 pm
by Marcel2586
yes it can with Adobe Photoshop or Gimp. turn the texture into black and white and then lower the colors to two colors, black and white.