C4D Sky vs OctaneSky

[Mayahi]

I'm trying to compare a C4D render to Octane render. In order to do this I would like to light the scene the exact same way. I'm not really sure how Octane interprets an image when I load it into an OctaneSky.

Compared to a C4D sky, the differences seem to be:

1. Octane flips the HDR on X axis

2. OctaneSky image is a lot more washed out (I'm assuming its linear interpretation) and has a greenish tint

Anyone know of a way to have the OctaneSky look exactly the same in terms of gamma and color as a C4D Sky?

Thanks!

[aoktar]

Hi,
what's the purpose of this? Octane have not to be same as c4d's sky. It has own algoritms to produce a sky. There is lot of parameters to change appearance of rendered image. How are you trying to put a image to sky?

Octane have a workflow for lighting the scenes.
A environment lighting and some geometry with emissive materials. Environments can be a Octane daylight or a hdri kind texture or a combination of both.
Also you can put any textures to environment to illuminate the scene. Even you can scale, rotate or tweak brightnes, etc. of this textures.

[Mayahi]

Hey Aoktar,

I'm basically just trying to get as close to a native Cinema render as possible so I can compare the render times for *almost* the same image. I'm aware Octane processes and sets up the scene differently.

I got pretty close results. I don't have a huge understanding of different color spaces, but the following seemed to get the renders pretty close in terms of gamma and color:

C4D Render:
1. Flip texture of HDRI sky and rotate to match
2. Enable Physical Render and GI
3. Set to linear in save options and sky texture

Octane Render:
1. In Cam Imager set gamma to 2.2 and response to linear.
2. In save settings set to sRGB (not sure why linear doesn't give me the results)

So I totally could be approaching this the wrong way, but the results are pretty close. If anyone has a better idea please say so!

[aoktar]

interesting. You are comparing apples to bananas. Octane is a path tracer. Works similar to brute force method of GI. But calculates every pixels without doing some aproximation.

[Mayahi]

Haha yes, I'm aware its apples to bananas.