Yasin Hasanian

YasinH

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CG Supervisor
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Recent Forum Posts

Mantra Light Shaders Aug. 20, 2020, 8:52 p.m.

jsmack
what do you mean by ‘light scaling’? An ies profile maps the light's intensity to the angle from its local z axis. Same as using a function to do the same in a light shader. The profile just has it ‘baked’.
Oh I didn't know Mantra actually respects light scale when using IES lights! Sometimes renderers hard-code the scale to the profile. This made the approach more sensible now. Now I need to figure out how to make custom IES profiles that matches with directionality…

Mantra Light Shaders Aug. 20, 2020, 7:18 p.m.

jsmack
YasinH
jsmack
YasinH
Yeah, that seems to be the case. Is there any way to somehow fake the power with this approach? Otherwise, it doesn't seem like there is any other way to implement the directionality…

I've created custom IES profiles to simulate directionality recently when I had to match VRAY renders which were making heavy use of directionality.

An IES profile is just a 1D image, so any ramp can be used to make one.
How would you change the angle on IES profiles though? Did you make different profiles for different angles, or do you mean to simply plug a ramp to environment?

I made a profile for each directionality value I needed.
That's a good idea but how would you deal with light scaling when using IES profiles? You can't really shape the light with them.

Mantra Light Shaders Aug. 19, 2020, 8:11 p.m.

jsmack
YasinH
Yeah, that seems to be the case. Is there any way to somehow fake the power with this approach? Otherwise, it doesn't seem like there is any other way to implement the directionality…

I've created custom IES profiles to simulate directionality recently when I had to match VRAY renders which were making heavy use of directionality.

An IES profile is just a 1D image, so any ramp can be used to make one.
How would you change the angle on IES profiles though? Did you make different profiles for different angles, or do you mean to simply plug a ramp to environment?