b92a6eab3a
This patch normalizes the Bloom output to be more energy conserving and
in a reasonable range. This is essentially constructed such that the
impulse response to a constant input maintains the same input.
The reason why Bloom has a very high range is because it accumulates a
downsampling chain without any sort of attenuation, so the final result
can be quite large. EEVEE fixed that by making the Strength range in the
[0, 0.1] range, so users who are used to that range think the default
value of a unit Strength in the glare node is large and hard to work
with. Hence the need for this patch.
The normalization factor is simply the length of the chain, since for a
constant input, all chain images will have the same constant input.
We need to version this change in a similar manner to how the glare node
was versioned in 004e3d39fa, where the scene render size is assumed. We
also assume the inputs are not connected, because they were turned into
inputs just last week, so we needn't worry about that case.
This is a partial implementation of #124176 to address #131325.
Pull Request: https://projects.blender.org/blender/blender/pulls/133037
Blender
Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing.
Project Pages
Development
License
Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license.
See blender.org/about/license for details.