Extract Irradience Value while in iray

Omniverse Developer Tools & Resources Samples & Examples
1

Hi there,

is there any method to extract the irradience value on a position in world?

grafik

Is it possible to store the irradience value inside of a variable or visuablize the value by plotting it in a graph?
(it is not practically possible for me to hover over the exact same position multiple times)

Reason beeing:
An Object should rotate so that it is looking at a receiver and reflect incoming light onto said receiver. To track data, it would be really helpful, if it would be possible to extract the light energy at a position on the receiving end.

Thanks in advance!

2

The last hovered pixel is stored in settings:

import carb

settings = carb.settings.get_settings()
print(settings.get("/iray/irradianceVal"))

You could potentially simulate the mouse movement, query that setting, and plot with omni.ui.Plot. Would that cover your use case?

3

Hi there.
First of all, thank you so much for your reply. The stored pixel is a nice way to implement it. Is there any way to simulate that mouse movement inside of omniverse or would that be a external application only?
First problem with an external thing which comes to my mind would be, if the stage (camera settings) isn’t 100% identical each time i’d request a polling of the setting.

My exact use case would be a simulation of different object settings - wich would require the extraction of the irradiance value of a position as identical as possible.

Edit:
Another thing that came up, by testing your approach. If i try to import ‘keyboard’ there is this error message showing up. I don’t quite get what the issue is. I’d like import the module ‘keyboard’ to track if a specific button is pressed and extract the irradiance value.

grafik
grafik1308×443 100 KB

4

Hi @Jens_G94. Sorry for the delay. I was trying to put together an example of simulating the mouse the didn’t feel too hacky, but I should ask. Is there a reason why you wouldn’t just render the Irradiance pass to an image and query the image?

5

Hi @mati-nvidia, in my scene i have a light source (a), a reflecting object (b) and a receiving object (c). I’d like to get the numerical irrandiance values at c, depending on the distances between a, b and c. - optimally without hovering over c by hand. Those distances are subject to change in different simulation cycles.

What do you mean by “query the image”?

Thanks for your time, so far!

6

Hi @Jens_G94. By “query the image”, I mean once you’ve written the renderer image to memory or disk, you could open the image and query the pixel values in the image.