Exposure Value in Vray for Grasshopper?

[seltzdesign]

I cant find a way to set the exposure value as you can in Vray for Rhino. The camera component only has inputs for ISO, F Stop and Shutter Speed.

Is there a component that can calculate the values? Shouldn't the camera component have an input for exposure value, so that if you only specify that, it can calculate the correct camera parameters the same way it does in Vray for Rhino?

Otherwise its not so easy to get the same exposure in Rhino and Grasshopper.

[konstantin_chaos]

Hi seltzdesign,

You can actually setup an EV calculator in Grasshopper like so:

The top part calculates the EV for a given F, Shutter and ISO.
The bottom calculates the correct ISO based on the desired EV , Shutter and F.
You can use the bottom logic and connect it to a camera.
The example definition is attached - EV calculator 02.zip

Another thing that you can do is use the Advanced Camera Parameters in Rhino and match the desired values in GH.

Hope that helps,
Konstantin

[konstantin_chaos]

And a Python script alternative - EV calculator 03.zip

[nikolay.bakalov]

We can also easily add an output parameter so at least you have some level of control