Spot light no longer projecting an image texture in Blender 3 #93565
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Reference: blender/blender#93565
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System Information
Operating system: Linux-5.15.5-2-MANJARO-x86_64-with-glibc2.33 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 21.2.5
Blender Version
Broken: 3.1
Worked: 2.93.6
Caused by
cb334428b0Short description of error
Spot light no longer projecting an image texture in Blender 3. When I switch light from spot light to Point light then it working. But in Blender 2.93 both lights working well.
Blender 3. Point light
Blender 3. Spot light
Blender 2.9 Spot light
Exact steps for others to reproduce the error
Download and open the example file: Projector.blend
Added subscriber: @Wovchick
#95392 was marked as duplicate of this issue
#95375 was marked as duplicate of this issue
#95150 was marked as duplicate of this issue
#93676 was marked as duplicate of this issue
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @PratikPB2123
Added subscribers: @sherholz, @brecht, @ThomasDinges
Issue introduced by
cb334428b0@sherholz @brecht Can you please take a look?Hi Thomas,
The problem is related to the fix of the spotlight.
Previously the spotlight with a radius was represented by an oriented disk (always oriented towards the illuminated point).
Now the spotlight is a disk with a normal oriented to the direction of the spotlight (fixed normal).
The problem seems to be that the shader graph uses the normal - which is now fixed to the spotlight direction - for the uv calculation.
Is there a reason why the texture projection is not using the uv space of the light source?
Hi Sebastian,
do you have an example, how it should be done now in the shader graph? Changing to the UV Output does not solve it for me. :)
By the way: the provided setup can be simplified for easier debugging, just connect the Texture Coordinate directly to the Image Texture, leaving the nodes in between out.
Added subscriber: @Nurb2Kea
System Information
Operating system: macOS-12.0.1-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.7.29
Blender Version
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-12-03 22:24, hash:
d5920744f4((last 3 versions and still continuing)Worked: (version: 3.0.0 stable, branch: master, commit date: 2021-12-02 18:35, hash:
f1cca30557Short description of error
Light 'normal' texture coordinates in nodes for spotlight not working anymore like it does in blender 3.00 as expected.
You have to switch to reflection in texture coordinates of the light nodes to get a projection from the light.
(Not sure but was it always possible to archive this with the other lights too?)
Exact steps for others to reproduce the error
Open attached file in blender 3.0.0 stable and switch to rendered viewport. (you'll see window shades shadows).
Then open the same blend file in any blender version 3.1, and you see that it's not working anymore, unless you switch the texture coordinates of the light to Reflection.
(And then you can't change the lights z rotation under item-panel to change angle/direction of the shades light projection. )
But the main problem is the texture coordinates for the lights aren't working as in blender 3.0.0 stable anymore
Thanks in advance
untitled.blend
Hi Thomas and Guido,
I looked at the problem and I can replicate it.
The questions which come to my mind are:
For the first.
Geometrically speaking, the normal of a sphere is always facing the observer,
the normal of the area light is orthogonal to the area surface and since the spotlight - at least now - is represented by a disk with a fixed orientation, the normal is also fixed and orthogonal to the disk.
Previously the normal value for the spotlight was set to the incoming direction.
@brecht : Should this be the intended behavior? By doing so it would not be possible to texture an area light.
This brings us to second.
What should be the universal way to texture virtual light sources?
Since the previous way only worked for spheres and spotlights, would it be preferable to look for a generic way?
I tried a similar approach as mentioned by Guido. When taking the Geometry Node and using the incoming attribute, the projection works again.
Unfortunately, the incoming direction is defined in the global coordinate system and not the local one of the light source.
As a result, the projection does not consider transforms (e.g., rotations of the light source).
I could revert the changes to the spotlight so that it reacts similar as before, but is this actually the intended behavior, or do we need a general solution that also works for area lights (e.g., adding a local incoming attribute) ?
To be honest, if you can make it work for all lights and that it works with transforms than it's fine to me.
That's how I learned it since 25 years ago. You have the textured light that can be moved, rotated, etc. including rotating z axis of the light to not have to move the light itself.
That was the trick for years to not have to build a shadow scene for the shadows coming through a window...for example.
Also I'm not restricted to spotlights. But that was the only one & you can focus the textured light so the shadows are blurry or sharp on the ground.
So you are the ones to choose the right way for the future + mabe keeping abilities.
If you decide another way that fit's better with light linking, I'm more than fine with it.
I think the best solution may be to make Texture Coordinate > UV do something useful for every light. Currently it's only useful for meshes / hair, since it's based on looking up a UV attribute.
Texture Coordinate > Normal I think makes sense to be the actual normal. A local incoming attribute is probably a bit obscure to guess for users.
Added subscriber: @deadpin
I discussed this further with @sherholz, we'll restore the old behavior so that the normal keeps working for texture coordinates, preserving compatibility. Making UV return something useful for lights can be done on top of that.
Marking as high priority so we remember to do this before 3.1 is released.
Sounds good to me, since light linking is coming and could maybe managed at the same time.
THX
Added subscriber: @Raimund58
Just a short update.
I think I will find some time over the holidays to work on the fix,
so there should be a MR at the beginning of the year ready.
Added subscribers: @MarcoHoo-3, @Alaska
Added subscriber: @zanqdo
As a workaround I found switching spotlights to Reflection coordinate instead of Normal works in 3.0 and 3.1
Works only with still but when having an already set animation of the coordinates of the light, you can do it all over again...
Added subscriber: @user1
I stand corrected, It's not 100% the same at high angles :(
Will wait for the normal fix
Hi,
I just submitted a patch to revert the normal behavior to the old one.
https://developer.blender.org/D13991
This issue was referenced by
01f1b51a2eCan confirm it working on Build: version: 3.0.1, branch: master, commit date: 2022-01-25 17:19, hash:
dc2d180181Not sure when it get's ported to 3.1 - 3.2 !?
Changed status from 'Confirmed' to: 'Resolved'
This issue was referenced by None@62824