Which specific options do you need?
I just like the option to set the gamma and multiplier in the Vray HDRI and then have all the settings of the Vray light to control it.
- Targeted Light.
- Intensity Multiplier.
- Affect diffuse - specular - reflection.
- Invisible.
- Exclude/Include.
I just like to not have to travel around max to get to those settings the other way. And in some funny way I see it as another light in the scene.
- Targeted light - You can create your plane, and a dummy, and use "Look at" constrain
- Intensity multiplier - There is an emission level in the CoronaMTL, that is it
- Affect diffuse - specular - reflection - In Alpha V5, this is a bit more tricky. If you do not want to affect diffuse, then use ConstantMTL and disable diffuse GI. For not affecting reflection/refraction, uncheck it in object properties. Unfortunately, you can not separate these two in Alpha V5.
- Invisible - Just uncheck visible to camera in object properties.
- Exclude/Include - Not possible at the moment. We are getting into extremely specific scenario here. If someone does as photorealistic rendering as actually mapping HDRI softboxes on light, the it is extremely improbable same person will want to do such fakes as restricting which objects are lit.
That being said, in Alpha V6, it will be resolved a bit better.
It will have most of the features shared with CoronaLight. I will ask Ondra if include/exclude and directionality would be possible in LightMTL as well ;) It should...