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Large Area lights - which is fastest?


dutch
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I've built an interior for a large warehouse type building (about 14 meters from floor to ceiling). The only light source comes as a "sun" from 4 meter openings near the ceiling. I want the light to be extremely soft so the light on the exterior is about 50 meters across to simulate a cloudy day.

 

I've started out with a target directional light, with area shadows turned on. This is accurate, but also very slow to render because the subdivs need to be cranked up.

 

Secondly I tried using the vray light material on a plane. (I can't give much feedback, but i will play with this some more).

 

Thirdly, I tried to use a vray light with "store with irradiance map" checked. This is fairly fast, but shadows on the smaller details are fairly blurry or non existent.

 

Basically, I just want to know what method is best for simulating a very very soft light shining into an interior space.

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This took 9 minutes with a direct light with vray area shadow at 20 subdivs.

 

Ir is set to medium and HSph is at 70, interp at 26.

 

LC is at 2000 subdivs.

 

DMC:

adaptive amount 0.1, min samples 8, noise thresh 0.01, global subdivs x @ 1.0.

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