OTOY Forums

In progress...

You are off to a nice start. It looks like you are getting some nice, soft shadows with the daylight system. Did you modify the default settings to achieve that?

some parts of image is very good. But need more lighting effect of raw diffuse textures. Woods expecially

BKEicholtz wrote:You are off to a nice start. It looks like you are getting some nice, soft shadows with the daylight system. Did you modify the default settings to achieve that?

No daylight system. Environment map!

Do you mean you are using a HDRI? How do you get real shadows with it?

PAQUITO wrote:Do you mean you are using a HDRI? How do you get real shadows with it?

Yes, the light coming from HDRI image.
The trick is to overexpose the sun disk in photoshop.
It's possible to correct the gamma of the HDRI image, but for value over 1.3/1.4, the color casting become too strong.
For some reason, the gamma adjustment for some HDRI won't work for value not equal to 1.0 or 2.0.
I need to investigate...

noldo wrote:

PAQUITO wrote:Do you mean you are using a HDRI? How do you get real shadows with it?

Yes, the light coming from HDRI image.
The trick is to overexpose the sun disk in Photoshop.

I'm trying to understand this. I have a nice HDR environment, and I want to have it light my object, and cast a shadow. I load it inot Photo Shop, but can only change the exposure of the whole thing. Can you give me a clue in how you adjusted the exposure of only the sun in your hdr?

I've noticed that the bricks on the right aren't tiled correctly, anyway that's a good render.

noldo wrote:

PAQUITO wrote:Do you mean you are using a HDRI? How do you get real shadows with it?

Yes, the light coming from HDRI image.
The trick is to overexpose the sun disk in photoshop.
It's possible to correct the gamma of the HDRI image, but for value over 1.3/1.4, the color casting become too strong.
For some reason, the gamma adjustment for some HDRI won't work for value not equal to 1.0 or 2.0.
I need to investigate...

I have a few HDRI:s from http://www.cgskies.com/

Those cast pretty nice shadows, but I do need to adjust the gamma a bit for them to show up. Haven't tried them in Octane, but I guess it's pretty much the same as in other renderers.

http://www.cgskies.com/resources_tutorial_rendering.php
Here they actually show how gamma adjustment effects the image. With the default the shadows are very hard to see.

The price is pretty reasonable considering that the images are up to 15000x7500 resolution.

gordonrobb wrote:

noldo wrote:

PAQUITO wrote:Do you mean you are using a HDRI? How do you get real shadows with it?

Yes, the light coming from HDRI image.
The trick is to overexpose the sun disk in Photoshop.

I'm trying to understand this. I have a nice HDR environment, and I want to have it light my object, and cast a shadow. I load it inot Photo Shop, but can only change the exposure of the whole thing. Can you give me a clue in how you adjusted the exposure of only the sun in your hdr?

Open the hdri image in photoshop, select with the elliptical marquee tool the sun disk, adjust the exposure of the selection, save the hdri, then open in octane render.
Just pay attention to no overexpose the hdri, otherwise octane not take account the sun.
Proceed with one stop (1.0) for every adjustment of the hdri, and in octane deselect & select the importance sampling flag in texture environment (sometimes gets stuck).
Another aid is to fade the selection before adjusting the exposure of the hdri (some pixel, depending on the dimension of the sun), this influence the definition of the shadow.
Good work!