SSR + Reflection Plane with 0 roughness cuts off/blinks reflection at certain view angles #60803

New Issue

Firepal · 2019-01-23T21:48:23+01:00

Firepal commented

2019-01-23 21:48:23 +01:00

System Information
Operating system: Windows 10 Pro
Graphics card: Nvidia GTX 860M

Blender Version
Broken: 2.80, dc3b5024be, 2019-01-23

Short description of error
When using Screen-Space Reflections and a Reflection plane at 0 roughness, Blender cuts the reflection short when the viewport/camera is looking at the reflection at certain angles.

No amount of EEVEE samples remedies this, however, if the roughness is not 0, the problem dissapears.

Exact steps for others to reproduce the error

You can use this .blend file and rotate around the mirror or see the camera animate to affected areas.
ssr0roughnessbug.blend

Or, you can recreate the scene if you wish.

Create a plane mesh facing up to use as ground.
Create another bigger plane mesh facing horizontally to use as a mirror with a glossy shader WITH ROUGHNESS SET TO 0, then put it into a collection.
Add a reflection plane with the same size of the mirror, place it in the same spot as the mirror, set the collection visibility to "inverted" and choose the mirror's collection.
Enable Screen-Space Reflections, and rotate around the mirror. It should blink when you're rotating the camera.

**System Information** Operating system: Windows 10 Pro Graphics card: Nvidia GTX 860M **Blender Version** Broken: 2.80, dc3b5024be1a, 2019-01-23 **Short description of error** When using Screen-Space Reflections and a Reflection plane at 0 roughness, Blender cuts the reflection short when the viewport/camera is looking at the reflection at certain angles. ![ezgif-2-e4f27fd88de5.gif](https://archive.blender.org/developer/F6382166/ezgif-2-e4f27fd88de5.gif) No amount of EEVEE samples remedies this, however, if the roughness is not 0, the problem dissapears. **Exact steps for others to reproduce the error** You can use this .blend file and rotate around the mirror or see the camera animate to affected areas. [ssr0roughnessbug.blend](https://archive.blender.org/developer/F6382207/ssr0roughnessbug.blend) Or, you can recreate the scene if you wish. 1. Create a plane mesh facing up to use as ground. 2. Create another bigger plane mesh facing horizontally to use as a mirror with a glossy shader WITH ROUGHNESS SET TO 0, then put it into a collection. 3. Add a reflection plane with the same size of the mirror, place it in the same spot as the mirror, set the collection visibility to "inverted" and choose the mirror's collection. 4. Enable Screen-Space Reflections, and rotate around the mirror. It should blink when you're rotating the camera.

Firepal commented

2019-01-23 21:48:23 +01:00

Added subscriber: @Firepal

William Reynish commented

2019-01-23 21:52:01 +01:00

Added subscribers: @fclem, @WilliamReynish

William Reynish commented

2019-01-23 21:52:01 +01:00

Could not reproduce. I get no blinking here. Probably a GPU driver thing?

@fclem Any ideas?

Could not reproduce. I get no blinking here. Probably a GPU driver thing? ![Screenshot 2019-01-23 at 21.51.12.png](https://archive.blender.org/developer/F6382250/Screenshot_2019-01-23_at_21.51.12.png) @fclem Any ideas?

Firepal commented

2019-01-23 21:56:14 +01:00

@WilliamReynish Does it cut off/"blink" when you render ?

Clément Foucault was assigned by William Reynish

2019-01-23 21:59:53 +01:00

William Reynish commented

2019-01-23 21:59:53 +01:00

Yes, indeed it does.

@fclem: For me I can only reproduce then when rendering out the scene.

Yes, indeed it does. @fclem: For me I can only reproduce then when rendering out the scene.

Firepal commented

2019-01-31 18:34:14 +01:00

I have also noticed that SSR draws over the Light Path node's "Is Glossy Ray" function, which is sort of bothersome, since you can't have roughness at all without SSR.
(I was not able to replicate this in the .blend file i provided at the top, for some reason.)

https://i.gyazo.com/8ba4c5671d5deb2c5cf566f7a19dd9cc.mp4

ssr_drawing_over_isglossyray_fac.blend

I have also noticed that SSR draws over the Light Path node's "Is Glossy Ray" function, which is sort of bothersome, since you can't have roughness at all without SSR. (I was not able to replicate this in the .blend file i provided at the top, for some reason.) https://i.gyazo.com/8ba4c5671d5deb2c5cf566f7a19dd9cc.mp4 [ssr_drawing_over_isglossyray_fac.blend](https://archive.blender.org/developer/F6466916/ssr_drawing_over_isglossyray_fac.blend)

blender-admin commented

2019-03-16 00:50:50 +01:00

This issue was referenced by 3600bb79d0

This issue was referenced by 3600bb79d05d9a115ca036f1dcb864205ef3c0ce

Clément Foucault commented

2019-03-16 00:51:50 +01:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-03-16 00:51:50 +01:00

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SSR + Reflection Plane with 0 roughness cuts off/blinks reflection at certain view angles #60803