How to increase the brightness of indirect lighting

[Lucetius]

As a professional lighting designer, I am a bit confused as to how the GI/indirect lighting features operate. I having difficulty adjusting the contrast of the dark/shadowed areas of the scene without affecting the rest of the lighting.

If you look at the attached image, I'd like to increase the brightness of the area noted with out adding an additional light or affecting the rest of the scene.

Any thoughts/suggestions are welcome.

Thank you

[natty]

you should give photon mapping a go for your second bounce.

[Da_elf]

also if you increase the secondary multiplier in conjunction with increasing the amount of bounces this would help as well

[mike_kennedy]

color mapping can fudge this as well

[natty]

but he doesnt want to change the overall colour of the image... he just needs to get more light into the space.

[RoarK]

in linear color mapping, by increasing the dark multiplier, dont we get the dark areas in a scene look brighter...and subsequently reduce the bright multiplier so the rest of the scene doesnt get burned out? im not very sure about this.

[tricky]

Probably the best way is to comp two renders together (if your PC is quick enough!). Make one setting as you have and render - this is the external exposure. Then render the same but with 4 or 5 x multiplier for the environment colour - this is the interior exposure.

Comp the results together in PShop.

[tom schuelke]

I would do two things

first increase your bounces, so light can travel deeper in your scene.

vray computes the amount of reflected light based on the rgb values which often doesnt´t bring the physical correct results. changing the color affects first the color of your scene objects, and secound might increase colorbleeding in an annatural way.

for this reason max radiosity comes with an advanced lightning override material to overcome those rgb value things.

i think, using i-map, you shoud go to your vray settings, go to objects, and increase the gi- multiplier value, which leads the objects to reflect more diffuse light from the objects.

another way to get the same result is not to change the object settings in vray, but to use the vray wrapper material, which i think is the nearest solution compared to the max radiosity override material.

maybe this helps you.

tom

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