kristofferhelander

Booth Color Mapping and Exposure changes the values of the pixels. So by turning them off, you get the raw light data. You can then do the Exposure in post.

For creative control of the look and feel of your renderings, I think V-Ray is a better choice. The Arch&Design materials of mental ray doesn't support light-linking or shadow exclusion (there's a workaround though) and are mainly aimed towards photo realistic materials. V-Ray lights has better (or at least easier) support for area shadow (every standard light can have area shadows), and it supports light linking and shadow exclusion. V-Ray also have very nice Render Elements. I've been using mental ray for a lot of years and after trying V-Ray for the last couple of weeks I feel that renderer offers more creative control or flexibility. Then of course you can always choose different renderers for different objects/scenes or whatever. With the new State sets render pass system it's fairly easy to switch back and forth.

16-bit PNGs are not floating point and not Linear so the maths breaks down. You can perhaps sort of save it with Screen as mentioned. But for true compositing you are better of using floatingpoint 32bit, OpenEXR.

Thanks, that second one was new to me. I'll have a look

Exposure is a form of Color Mapping, so by using it you're breaking the linearity of the image, it is no longer Gamma 1.0. So for compositing this is not good. Keep it linear and only display it in sRGB.

Don't you get a full HDR image if you just disable exposure and render to floating point EXR?

Cheers mate! That's what I wanted to hear!

Hello mates, I've started to look into compositing with V-Ray Render Elements, so far I have come up with this formula for compositing: (DiffuseFilter * Raw GI) + (DiffuseFilter * Raw Light) + Reflection + Refraction Which gives you your original render but now you can colour correct the GI and direct light independently, as well as reflection and refraction. However, V-Ray has got a lot of more Elements, so there must be a lot more possibilities. How do you composite your Elements, what's your formula? Cheers!

Hi everybody, I have an interior scene with VRaySun and VRaySky and some Skyportals, I use a standard camera but with VRay Exposure Control in the Environment Dialogue and I render either with Gamma in the Color Mapping rollout set to 1.0 or 2.2 with the Don't affect colors (adaption only) option ticked. When I add VRayLights to the scene to represent light bulbs they hardly add anything to the overall illumination. I set the Intensity Unit to Luminous power (lm) and test values between 1000 to 3000 lm, from what I gathered from a lamp/light reseller website that's round about what a 100W light bulb has, around 1000lm. But as I said, they hardly brighten the scene at all. The Colour Temperatur I set to round about 2700K, what gives it a yellowish tint. Is this due to that the exposure is set to work for the VRaySun? If you want to brighten a particular part of the image, how would you do that, since the VRayLigts doesn't do much unless I set the lumen to like 50000 or so, but then it looks very strange for it is much brighter closer to the source and falls of vary rapidly; which I guess is due to the Inverse square law. Brighten it up in post? Or use "light cards" (not sure what it's it called) to bounce in extra lights, like photographers do? Thanks, cheer! //Kristoffer

Hi everybody, I have an interior scene with VRaySun and VRaySky and some Skyportals, I use a standard camera but with VRay Exposure Control in the Environment Dialogue and I render either with Gamma in the Color Mapping rollout set to 1.0 or 2.2 with the Don't affect colors (adaption only) option ticked. I like using the HSV exponential Color Mapping type because it brings back the blue colors in the sky and makes the antialiasing of the edges around very bright areas a lot smoother. But all these color mapping related things, Color Mapping (anyone that is not Linear multipy), Exposure Control, VRayPhysicalCamera messes with the pixel values and breaks the Linear Workflow right? So when compositing render elements or, render layers/passes these need to be disabled to keep everything linear in the compositor, right?? Thanks, cheer! //Kristoffer

Ah, cool article! I'll have a look at it, thanks!

Could you give me something more to go on? The search engine isn't exactly reading my mind What was the post's title?

Hello there! I'm a long time visitor here but this is my first post I thought I'd kick off my membership here by getting some deeper understanding of the V-Ray DMC Sampler. When using the Adaptive DMC image sampler you can check the "Use DMC sampler thresh." checkbox Now, what's the benefits/disadvantages of doing this as oppose to using the "Clr tresh."? And when/what situation can it be beneficial to use the "Clr tresh." instead? And what is the DMC Sampler-rollout doing when using any of the other image samplers, Fixed or Adaptive subdivision? What effect does the "Noise threshold" or "Adaptive amount" variables have when not using Adaptive DMC as image sampler? Cheers! //Kristoffer