LC vs IM (VRAY)

[alslider]

Hi guys.
I am trying and failing to understand the fundamental, theoretical difference between IM and LC.
They are both view dependent approximative methods and yet in many places LC is compared to PM which is precise and view independent.
I understand that the calculation method is different but I cant see how except maybe when using “Screen” scale mode.
Still they both seem to use the same interpolation filters and overall seem to share the same “idea” except that IM uses pre-passes to gather scene data and PM cells.

I know its not critical to know this but I have to understand and documentations provide little help on this matter.

Can anyone shed some light on this please?

[noouch]

My understanding is that IM shoots a bunch of rays into the scene based on the subdiv parameters, giving you a single bounce of GI. You can couple it with brute force GI to extend the rays’ trace depth. LC is a bit different in that it traces a light path until it dies off, either by exiting the scene, or going under a threshold after which no more bounces are calculated. As the documentation states, the light cache is not adaptive, and will continue sampling until the limit is reached.

It’s all described a bit better in the new documentation: http://www.spot3d.com/vray/help/200R1/render_params_lightmap.htm

[keraj37]

My understanding is that IM shoots a bunch of rays into the scene based on the subdiv parameters, giving you a single bounce of GI. You can couple it with brute force GI to extend the rays’ trace depth. LC is a bit different in that it traces a light path until it dies off, either by exiting the scene, or going under a threshold after which no more bounces are calculated. As the documentation states, the light cache is not adaptive, and will continue sampling until the limit is reached.

It’s all described a bit better in the new documentation: http://www.spot3d.com/vray/help/200R1/render_params_lightmap.htm

So, it means that LC is more like unbiased GI?

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