Fisheye lens results in Window projected textures being mirrored across X-axis #60542

New Issue

M · 2019-01-15T21:04:57+01:00

M commented

2019-01-15 21:04:57 +01:00

System Information
Operating system: Linux x64
Graphics card: GTX 860m

Blender Version
Broken:
Any of the 2.80 daily builds I tried since several months ago.

Short description of error
Using Cycles with a fisheye lens camera, both Equisolid and Equidistant, and some texture with Window projection from the Texture Coordinate node flips the X-axis of the texture.
None of the other lens and projection types behaved like this as far as I saw.

Here's a render with perspective (top) and fisheye (bottom) illustrating the problem.

And here's a small .blend file. Set the view to Rendered and the camera lens to Panoramic.
fisheye bug.blend

**System Information** Operating system: Linux x64 Graphics card: GTX 860m **Blender Version** Broken: Any of the 2.80 daily builds I tried since several months ago. **Short description of error** Using Cycles with a fisheye lens camera, both Equisolid and Equidistant, and some texture with Window projection from the Texture Coordinate node flips the X-axis of the texture. None of the other lens and projection types behaved like this as far as I saw. Here's a render with perspective (top) and fisheye (bottom) illustrating the problem. ![perspective vs fisheye equisolid.png](https://archive.blender.org/developer/F6297999/perspective_vs_fisheye_equisolid.png) And here's a small .blend file. Set the view to Rendered and the camera lens to Panoramic. [fisheye bug.blend](https://archive.blender.org/developer/F6298295/fisheye_bug.blend)

M commented

2019-01-15 21:04:57 +01:00

Added subscriber: @Snudl

Jacques Lucke commented

2019-01-16 12:16:10 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2019-01-16 12:16:10 +01:00

In a debug an assert fails.

With asserts I can reproduce the bug. I never used these different camera types, so I'm not sure what to expect.

In a debug an assert fails. With asserts I can reproduce the bug. I never used these different camera types, so I'm not sure what to expect.

Tim Stullich commented

2019-05-29 12:21:25 +02:00

Added subscriber: @tstullich

Tim Stullich commented

2019-05-29 12:21:25 +02:00

Hello, could you post the output of the assertion that fails? This would be helpful in trying to find the source of the problem

Brecht Van Lommel commented

2019-05-29 12:25:40 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2019-05-29 12:25:40 +02:00

The assert is most likely unrelated to the bug, just some NaN.

The bug here would be in camera_world_to_ndc, or the data that goes into it.

The assert is most likely unrelated to the bug, just some NaN. The bug here would be in `camera_world_to_ndc`, or the data that goes into it.

Tim Stullich self-assigned this 2019-05-29 12:41:38 +02:00

Tim Stullich commented

2019-05-29 12:41:38 +02:00

Ok, I will take a look around and try to find the source of the bug

Tim Stullich commented

2019-06-10 20:30:47 +02:00

I was able to trace down some things to direction_to_fisheye_equisolid but I am unsure of how that function was implemented. @brecht is there some documentation on how the equisolid fisheye lense was implemented?

I was able to trace down some things to `direction_to_fisheye_equisolid` but I am unsure of how that function was implemented. @brecht is there some documentation on how the equisolid fisheye lense was implemented?

Brecht Van Lommel commented

2019-06-14 19:02:22 +02:00

There's no documentation for it that I know of. There's two functions here, which should do the inverse of the other. So unless the input to the functions is somehow wrong, it's a purely mathematical thing where the formulas are just not matching.

Tim Stullich commented

2019-06-19 16:11:02 +02:00

I tried verifying if the inputs are correct for the camera_world_to_ndc function and I am not sure they are quite correct. One thing I tried doing was changing the variables P and the kernel_data.cam.worldtocamera matrix such that the output moves into the correct position, but I did not get very far with that.

There's two functions here, which should do the inverse of the other

Could you please elaborate on that statement? Which two functions perform the inverse of each other? I will try verifying if they perform how they are supposed to once I know more about them.

I tried verifying if the inputs are correct for the `camera_world_to_ndc` function and I am not sure they are quite correct. One thing I tried doing was changing the variables `P` and the `kernel_data.cam.worldtocamera` matrix such that the output moves into the correct position, but I did not get very far with that. > There's two functions here, which should do the inverse of the other Could you please elaborate on that statement? Which two functions perform the inverse of each other? I will try verifying if they perform how they are supposed to once I know more about them.

Tim Stullich was unassigned by Dalai Felinto

2019-12-23 16:35:22 +01:00

Philipp Oeser removed the

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Fisheye lens results in Window projected textures being mirrored across X-axis #60542