Corentin Demougeot

Unreal Engine Technical Artist.

[Corentin Demougeot @UTCompiler]

Comparison Unreal default cine camera and Raytraced lens simulation plugin

#indiedev #UE5

[Corentin Demougeot @UTCompiler]

@julienrln Yes the dof is more natural and fit with the lens you use

[Corentin Demougeot @UTCompiler]

Comparison Unreal default cine camera and Raytraced lens simulation plugin

#indiedev #UE5

[Corentin Demougeot @UTCompiler]

ADOF and lens tracing dont work the same way. Lens tracing is a single pass where rays are sent through a lens prescription. I compute a ray matrix for the prescription once on CPU side, from there the GPU finds where each ray lands on the sensor in one step, so it can run in real time.

If you want to see how it behaves in the editor, when r.LensTracer is set to 0, it renders through the default Unreal cine camera:

[Corentin Demougeot @UTCompiler]

@Alessan13244272 I add this in my todo!

[Corentin Demougeot @UTCompiler]

Here’s a benchmark. For the video I used the Petzval 85 mm, the other two are more classic designs.

To answer your question, it depends on the lens, and mostly on its field curvature, how much of the frame the lens leaves out of focus. The cost follows the blur, for now.

Even if the ms are still high, being able to run this kind of simulation in real time is already a big step, and I now have a few technical ideas to make it game ready for a wider range of lenses. So thank you for your comment!

[Corentin Demougeot @UTCompiler]

@Rolf_of_the_Son Thank you! Performances are impacted, depending on which effects are enabled and the number of ray used. Im working on new optimizations for next updates

[Corentin Demougeot @UTCompiler]

btw, I just published a Lite free version on Fab, if you want to give it a try!
https://t.co/hu2A1pBlTo

[Corentin Demougeot @UTCompiler]

@sweenus987 Yes its a compute pass at the end of the post process chain

[Corentin Demougeot @UTCompiler]

@BurneySbb Thank you 🙏

[Corentin Demougeot @UTCompiler]

@BurneySbb Yes! Its a trace through the lens. I use real optical designs and compute how each ray travels through the lens to the sensor. For the video, this is the ue5 data asset of the lens (see screenshot). So bokeh, distortion, vignetting... are all physically based

[Corentin Demougeot @UTCompiler]

@MR3Dev Yes it is!

[Corentin Demougeot @UTCompiler]

@MR3Dev It doesn't, but it's something that can be implemented, I keep this in mind for a next update!

[Corentin Demougeot @UTCompiler]

Liquid shader for UE5.8 now available on Fab

https://t.co/MpuCkjnGmv

#indiedev #UE5

[Corentin Demougeot @UTCompiler]

Ray traced lens simulation in unreal using real lens data

https://t.co/rh1l6YisXs

ISO 100, f/2.8, 1/60s, 44x24.75 mm sensor.

#UE5 #indiedev

[Corentin Demougeot @UTCompiler]

@MOCHITSUNAMI 🙏

[Corentin Demougeot @UTCompiler]

@rob_robby Thanks :D

[Corentin Demougeot @UTCompiler]

1/ Playing with lens tracing plugin to shoot footage in UE5

#UE5 #UnrealEngine5

[Corentin Demougeot @UTCompiler]

@Dave_MW Thank you Dave! Feel free to reach out with any questions about the plugin 🙂

[Corentin Demougeot @UTCompiler]

1/ Playing with lens tracing plugin to shoot footage in UE5

#UE5 #UnrealEngine5

[Corentin Demougeot @UTCompiler]

Plugin available on fab
https://t.co/4uzZXZsThG

[Corentin Demougeot @UTCompiler]

using telephoto lens 180 mm and Petzval 50 - 100mm