Compositor: Viewport issues when zoomed in #111344
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Reference: blender/blender#111344
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Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-21 10:12, hash:
f0a8c1946162
Worked: never
Short description of error
Composition Mask is "rendered" wrongly in the viewport when the camera is not fully in view.
Exact steps for others to reproduce the error
Current buggy result:
![image](/blender/blender/attachments/3d03ef99-cca0-4c22-b02f-e6d8219ba5c9)
The mask only matches when the entire camera is in view:
![image](/blender/blender/attachments/afa94e35-ecc5-40af-a4df-c340c4ca3f20)
I can confirm the problem.
I suppose it has something to do with the
rcti get_compositing_region()
function incompositor_engine.cc
.The code was introduced in
cc78fd4e93
by @OmarEmaraDevConsider the following example where we have a 1000x800 viewport and a 500x500
final render resolution, and consequently a camera of the same resolution.
We have two options for how the compositor should operate on that setup, each of
which is discussed in the following two sections.
Camera Compositing
The compositor can constrain itself to the camera region, and out of camera
regions will be left unaltered regardless of passepartout.
Advantages:
compositing pipeline.
have the same size in both compositions and will align with the camera in their
identity transform.
able to align images easily.
Disadvantages:
the passepartout is not opaque.
Viewport Compositing
The compositor will operate on the entire viewport and will ignore the camera
view.
The aforementioned advantages and disadvantages are essentially reversed, but
can be partially alleviated using the alternatives described in each of the
following sections.
Transformed Input Resources
Input resources can assume the size of the camera region and transformed
relative to the space of viewport such that they align with the camera.
The disadvantages is that pre-transformed resources can be unintuitive to work
with, for instance, rotating the resource will also move it due to the centered
pivot of the compositor transforms. Moreover, when realized on the domain of the
viewport, the areas outside of the original mask will assume a zero values,
which might not be what the users wants. Finally, the different domains of the
inputs can be harder to reason about for users, as opposed to having all inputs
have the same domain.
Padded Input Resources
Input resources can be zero padded to the size of the viewport, such that all
inputs will have the same size.
This alleviates the different sizes disadvantages but shares the rest of the
disadvantages as the transformed input resources alternative.
Neither of the alternatives workarounds the aspect ratio change and the
difference in sizes. To workaround those, one would have to change all nodes to
operate in the scene camera space. Except this would break setups where one is
processing an image that is standalone or simply is not related to the scene.
Perhaps this deserves a topic on DevTalk.
For "Camera Compositing", in my opinion, even with the weirdness, I feel it would be more useful to constrain to the camera region.
(It would be interesting to see pictures showing the disadvantages.)
For "Viewport Compositing", if the camera aspect is kept for the composition region, I imagine the composition should also be cropped just like in camera view.
(Some kind of border should be drawn in this case.)
If compositing the entire viewport is really useful for some cases. Then it could have an option in the popover.
Like
[X] Keep Rendering Aspect
.@OmarEmaraDev It may help to clarify how people expect (or are expected) to use the Viewport Compositing (as oppose to the camera compositing).
The Camera Compositing doesn't need all nodes to be in Scene Camera Space. What it needs is for nodes to have their absolute pixels to be internally converted to the scene camera space relative to the camera 100% size.
And on top of that to have the aspect ratio respected. For me the simpler example is how border render should just work with the viewport compositor, and give you the same result as if you were to render it out with F12.