Hdri Là Gì

[Carol Gudes]

Basedon my understanding, if the quality of the HDRI is high then the sun on it will be strong enough to produce good, accurate shadows. If not, well then you can help yourself by adding a V-Ray sun to kind of enhance the effect of a sun being present. Quality HDRIs usually have more information in them ala the sun power is still there once you go to really low exposure values (this is just an example).

They are of a high quality most definitely and shadows etc are on point. You mention exposure at lower levels, I assume its correct to increase the camera exposure to compensate for lower light levels in the scene? i.e. obviously not having a Vray sun present in addition to a HDRI means there is less light being generated. I'm usually set with an F-stop of 10-14 with both a sun and HDRI, but using a HDRI alone I'm at F-stops of 2 minimum. Is this normal/expected? Would one look to increase the render multiplier within the Vray HDRI material too?

As said in the previous post, if the HDRI is of sufficient quality it should be able to light the scene and cast good shadows with ease. If you are still struggling with the sharpness of your shadows, try playing with the gamma of the HDRI.

The reason people inventing/ using sun or other directional light together with HDRI Dom lighting is to overcome the unsharp shadow problem that usually arise whenever use hdri map. In order to get a sharp shadow in case gamma inverting option is not helps much. Because many of hdri light source usually diffused therefore the shadow is not too obvious whenever one need that fx in their scene.

I primarily use HDRIs to light the scene and for the background image. I copy the HDRI to the background so that I can adjust the settings independent of the lighting. Then between the camera exposure and the HDRI used in the GI I get nice results.

People before me already answered this one but my two extra cents to this debate would be that yeah, try sticking to the values that are deemed "believable". It is normal to tweak them up and down, left and right but just for the sake of keeping things somewhat averaged I tend to stick to the more realistic values - I suppose this might help in translating materials you develop from one scene to the next.

There's no need in extra VraySun. Just open exr file in Photoshop, steal the color value in the center of the sun but pump up the value to +6-11 stops; then make one touch of round brush with say 90% softness in the center of the sun (to find it, you should lower the exposure`display slider).

I have had so many major issues the last couple years I wasn't sweating the small things. Now, I guess it is time to sweat the small things. Why do I need to turn off my HDRI, which is in the Environment slot, to rotate my sun? With it on, it is so slow I want to pull my hair out.

You are not completely understanding. HDRI in MAX's environment slot and enable seeing it in the viewport. Rotating it is extremely slow and not worth trying. This stopped working properly in 2017 and hasn't been fixed since; MAX 2017 broke it.

A bit of a workaround is using a preview jpg saved from your hdri instead of the actual hdri file, if you want to quickly figure out the orientation of the map. If you want to animate or render you would switch back to the hdri. If your HDRI is 100 MB it's going to have a hard time updating it every frame in the viewport. If you purchase a set sometimes they will include previews and exr files. Do you need to do a lot of animation with rotating the sky?Anyway, just an idea.

I'm note sure if you have figured this out, but I have used the workflow in the following video to link an hdri/exr map to a dome system and sun. It definitely takes a bit to figure out and properly link the files, but I think this is in line with what you are looking for. Cheers!

I am having some frustrating issues with HDRI skies in Rhino 6 with Vray up to date. I can use the same file in Rhino 5 and my hdri sky will appear in the render, but in Rhino 6 the sky is not applied. I have attempted it in dome light, and also as an environment bitmap. I have attached my settings and an example of how the render is coming out.

I think you need to check all settings in V-ray for Rhino 6 . Then make sure assign the Hdri map in environment bitmap. so if you are using the Hdri map in v-ray dome-light make sure inadvisable option is off that means not need to use the Hdri in environment bitmap and v-ray sun light too that is depend on the type of hdri map .

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