Different camera position creates different brightness in IRAY

Moonwinc

I have been using Daz3d for a very very very very long time, but, this is the first time I have really hit this (or noticed).

When I was doing an outside scene which has multiple panels, I was taking a shot of the character from the front, and then one from the back. However, I noticed that everything went darker when I was taking the photo from the back.

I couldn't figure out what was going on so I decided to move back to Daz3d 4xx (I use Alpha because I have a 5090) and decided to start a little test to try and understand what was going on - but couldn't figure it out there either.

So to explain what I am seeing, and I am not sure why, and if there is something I am suddenly doing wrong - or I have totally forgot something important about light, Daz3d, IRAY, and Life :D

In picture one the camera is facing towards the light source (distant light), and that shadow is coming towards the camera. In this the brightness of the materials/objects is what I wanted
In picture two the camera is facing away from the light source (distant light), and the shadow is going away from the camera. In this the brightess is way to high, and the only way to fix it would be to reduce the distant light (but of course that impacts the shadow dulling it)
In picture three I have put them together to show the difference.
In my original it was the ground that showed me the difference which isn't really shown here, so I also did the picture 4 and 5 to show that when shadows are there, it darkens the materials/objects when you are facing into the light.

Now this might be light bouncing etc - but - how do you handle multiple scenes then when you are moving around a character because the increase and decrease in brightness doesn't seem realistic to me .... unless I have gone nuts :D 

Since I can't seem to work out if there is a way to set up exposure on a camera itself - and it is only scene based - I would assume you can change exposure to fix this, but that would mean loading between different exposures when moving the position. I ... haven't had to do that before.

So - any comments on what I am seeing - or ways to resolve?


 

 

 

 

 

Moonwinc

Of course another way to resolve this - is every time I have to take shots from different camera positions I need to change the Tone Mapping in Render Settings - but of course this is for the whole scene (I so wish this was per camera setting!!!!). So the only way I can figure out how to work around this issue is to match up a render setting preset and then load depending on camera position (facing/notfacing Distant Light source)

Another way is to add additional lights to brighten up the darker - but issue there is it again impacts the shadow and creates more shadows which is what I didn't want to do.