Lamp as camera: shadow buffer clipping extents sometimes inappropriately used as the viewport clipping extents. #62952

New Issue

gandalf3 · 2019-03-26T07:44:25+01:00

gandalf3 commented

2019-03-26 07:44:25 +01:00

System Information
Operating system: Archlinux
Graphics card: Vega 64

Blender Version
Broken: 2.80 f79ad42808, 2.79 d7ef1af22b.

Short description of error
See https://blender.stackexchange.com/q/134790/599
When using a lamp as camera, when in camera view, the viewport clipping extents are overridden with the lamp's shadow buffer clipping extents.
Unfortunately, not all engines or lamp types actually use the shadow buffer clipping extents or expose them in the UI, leading to confusing behavior.

Exact steps for others to reproduce the error

lamp_camera_clipping_extents.blend

Try changing the lamp's clip start, note that it updates the clip start in camera view.
Note that there is no way to change the clip end without changing the lamp type.

**System Information** Operating system: Archlinux Graphics card: Vega 64 **Blender Version** Broken: 2.80 f79ad428085e, 2.79 d7ef1af22bf. **Short description of error** See https://blender.stackexchange.com/q/134790/599 When using a lamp as camera, when in camera view, the viewport clipping extents are overridden with the lamp's shadow buffer clipping extents. Unfortunately, not all engines or lamp types actually use the shadow buffer clipping extents or expose them in the UI, leading to confusing behavior. **Exact steps for others to reproduce the error** [lamp_camera_clipping_extents.blend](https://archive.blender.org/developer/F6884450/lamp_camera_clipping_extents.blend) 1. Try changing the lamp's clip start, note that it updates the clip start in camera view. 2. Note that there is no way to change the clip end without changing the lamp type.

gandalf3 commented

2019-03-26 07:44:25 +01:00

Added subscriber: @gandalf3

Greg Zaal commented

2019-03-26 12:35:12 +01:00

Added subscriber: @GregZaal

Sebastian Parborg commented

2019-03-26 15:58:31 +01:00

Added subscribers: @fclem, @ZedDB

Clément Foucault was assigned by Sebastian Parborg

2019-03-26 15:58:31 +01:00

Sebastian Parborg commented

2019-03-26 15:58:31 +01:00

@fclem bug or not? I think this is intended to be used to visualize the light clipping.

Clément Foucault commented

2019-03-26 16:02:06 +01:00

Added subscriber: @brecht

Clément Foucault commented

2019-03-26 16:02:06 +01:00

The clip end is computed automatically based on light power. You can set it manually using the custom distance.

I don't know why using a lamp as a camera should be supported. @brecht was this a legacy feature from Blender Internal?

The clip end is computed automatically based on light power. You can set it manually using the custom distance. I don't know why using a lamp as a camera should be supported. @brecht was this a legacy feature from Blender Internal?

blender-admin commented

2019-03-26 16:07:42 +01:00

This issue was referenced by d67122e027

This issue was referenced by d67122e02733f38137148bdaab6e80c0f14f080a

Brecht Van Lommel commented

2019-03-26 16:10:44 +01:00

Any object can be a camera, which is a bit weird but probably not worth removing.

I'll just remove the behavior where it uses the lamp clip/start end for the camera, makes no sense anymore for Eevee and Cycles.

Any object can be a camera, which is a bit weird but probably not worth removing. I'll just remove the behavior where it uses the lamp clip/start end for the camera, makes no sense anymore for Eevee and Cycles.

Brecht Van Lommel commented

2019-03-26 16:13:38 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2019-03-26 16:13:38 +01:00

Pablo Vazquez commented

2019-03-26 16:31:50 +01:00

Added subscriber: @pablovazquez

Pablo Vazquez commented

2019-03-26 16:31:50 +01:00

In #62952#648732, @fclem wrote:
I don't know why using a lamp as a camera should be supported. @brecht was this a legacy feature from Blender Internal?

Objects as Camera was mainly for positioning e.g. a Spot light, so you could easily see where the Spot was pointing, what'd be seen or in shadow by that lamp (useful especially for the old buffer shadows).

If it brings trouble we could ask the community if it's still being used. I personally haven't used it in a long while.

> In #62952#648732, @fclem wrote: > I don't know why using a lamp as a camera should be supported. @brecht was this a legacy feature from Blender Internal? Objects as Camera was mainly for positioning e.g. a Spot light, so you could easily see where the Spot was pointing, what'd be seen or in shadow by that lamp (useful especially for the old buffer shadows). If it brings trouble we could ask the community if it's still being used. I personally haven't used it in a long while.

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Lamp as camera: shadow buffer clipping extents sometimes inappropriately used as the viewport clipping extents. #62952