Brush values from exr file should not be clamped between 0 and 1

[rubberduck9999]

Terrain3D version

v.1.0.1

System information

Godot v4.4.1.stable - Windows 10 (build 19045) - Multi-window, 2 monitors - OpenGL 3 (Compatibility) - NVIDIA GeForce RTX 4080 (NVIDIA; 32.0.15.6094) - Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz (12 threads)

Is the issue reproducable in the demo?

Yes

Issue description

I recently started creating my own exr brushes and discovered that values below 0 and higher than 1 get clamped.
When sculpting with these inside blender everything works as expected, here the results as reference.

In godot it looks like this

It feels like a bug, as with a format that supports values outside 0 and 1 I expected it to work, especially when I saw it in the preview, that it shows negative values. Otherwise it could be seen as a feature request too.

Here are the attached exr files, tested in the demo project.
clamping_issue_brushes.zip

Logs

No response

[TokisanGames]

I'm fine with values above 1. Why would someone use negative values?
I think this can be adjusted in editor.cpp:226, e.g.

		real_t brush_alpha = brush_image->get_pixelv(brush_pixel_position).r;
		brush_alpha = real_t(Math::pow(double(brush_alpha), double(gamma)));
-            brush_alpha = std::isnan(brush_alpha) || std::isnan(brush_alpha) ? 0.f : CLAMP(brush_alpha, 0.f, 1.f);
+            brush_alpha = std::isnan(brush_alpha) || std::isnan(brush_alpha) ? 0.f : MAX(brush_alpha, 0.f);

[rubberduck9999]

The idea with negative values I had is, that with these values in the source texture can be offset.
Though first I show a slightly different example what I did with some sculpting brushes I created a long time ago for blender
back then I used actually pngs and blender has an option to offset the brush this way, using the sample bias option here

This second image shows a newer use case, I baked this from a mesh, with the negative values in the brush I could leave the offset at 0.

height_test_brushes.zip

While I think negative values could be great for some uses, an option to offset the texture would be great too, even some existing brushes out there could make a use of it like in this example.