Using 2 HDRI's at the same time

Hylas

I have no idea how this could be accomplished technically...

But I would love a product that let's me use 2 HDRI's at the same time.

I would make half (or a third, or a quarter) of my skydome an outdoor HDRI, and the rest an indoor HDRI.

This would be useful for "fake" indoor scenes, where all the off-panel walls have been made invisible (eg. with section planes). The outdoor HDRI could shine through the window, and the indoor space could still be lit appropriately by the indoor HDRI.

Am I making sense?

Richard Haseltine

I don't know if LIE supports the HDR formats. If not you could perhaps do it in an image editor, or you could use the external HDR with the internal scene, render that to HDR (there are a few threads discussing how to do that), and then use the result for the real render.

Moved to Art Studio as it seems more a technique question than a product suggestion.

markusmatern

You could combine two (or more) HDRIs using any 2D software being able to handle layers and your preferred HRI file format.

You load each image into a separate layer and use masks to combine them.

I'm not sure whether this would give you the results you want.

However here is an image that shows how the edges of a room look in equirectangular projection usually found in HDRIs:

Note: The red lines are the edges of a cube with a small offset towards the ceiling.

You can even see the panorama on my blog here: https://www.panotwins.de/technical/comparing-a-mercator-projection-with-a-cube-face-projection/

Hylas

Thanks for the input!

I'm aware that I can do this via Photoshop.

I just thought it would be a cool product to have in DS so you don't have to take that detour.

Fishtales

The easiest way to make the interior light match the interior is to make the walls and /or ceiling Emissive and use the Diffuse maps in the Emission light colour and adjust the Lumen and Tone Mapping to a level that gives ambient light in the scene but doesn't make the walls/ceiling glow like a light bulb :)

WendyLuvsCatz

I combine them and edit them in Gimp, often I mirror skies on ones where I don't want the ground, also studio tif renders have a lot more information than png so convert well exported as hdr to reuse

plasma_ring

You can layer two HDRIs with Reshade kinda! I think with some noodling around you could maybe use it to do two different appropriate lights for two different parts of a scene, although I'm not sure how well it'd also work for a background image. Hmm..

Edit: It might not be a solution for OP, but this is how it looks if anyone's curious. 

The base HDRI creating the blue highlights is from PTF Legendary Lights, the reddish backlighting is Skies of iRadiance - Sunset in the Reshade light image slot, and the overall image in the main Reshade prop color slot is one of the white options from iRadiance Crystal. (I'm pretty sure you can stick any images you want in there.)