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Vue F.A.Q (Last Updated: 2024 Dec 13 6:58 am)



Subject: switch material base on sun angle?


lightning2911 ( ) posted Fri, 06 February 2009 at 12:46 PM · edited Sun, 01 December 2024 at 5:39 AM

i would like the shadow part of a sphere have another material than the lit part ... can this be done in the function editor?

i am thinking i would need an angle of incidence but not from the camera to object but from sun to object.

any ideas how this can be done?

thanks in advance
chris


Cherryman ( ) posted Fri, 06 February 2009 at 2:15 PM

If you don't want to animate you can easy make a mixed or layered material.  Adjust the angle and height to get the distributian where you want it.


nruddock ( ) posted Fri, 06 February 2009 at 2:16 PM · edited Fri, 06 February 2009 at 2:20 PM

I suspect it can be done in Vue 7 (in editions that have full access to the function editor or with the appropriate module installed) due to the new ability to refer to the properties of other objects in a node network.

It may also be possible in Vue 6 an possibly 5 (same proviso) but you'd have to use a constant node instead of being able to refer directly to the Sun.


Cherryman ( ) posted Fri, 06 February 2009 at 2:20 PM

PS. I do not know myself how it fnctions, but maybe the "distance on ray" input node can help here also.


dburdick ( ) posted Fri, 06 February 2009 at 4:04 PM · edited Fri, 06 February 2009 at 4:09 PM

This is easily done in Vue 5, 6 ad 7 although it's a bit more automatic in Vue 7 because you can link the sun direction/orientation to the material automatically.  In Vue 5 and 6 you have to key in the sun rotation values.  Here's how.  Create a mixed material with the two materials you want to use.  Set up the distribution of the materials as follows in the function editor.  Basically, you are just doing a dot product of the sun's rotation against the normal (world standard) of the object.  In Vue 7, you can link the sun's orientation into the function editor automatically -- and when you move the sun around, it will automatically update the material distribution.  In Vue 5 and Vue 6, you have to manually key in the sun rotation coordinates when the sun is moved.

http://www.skinvue.net/Vue7/VueLightFresnel.jpg


lightning2911 ( ) posted Fri, 06 February 2009 at 11:39 PM

dot product ... of course :) you're my hero!
i love the function editor


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