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Brush size adjustment depends on view angle


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Affinity Photo 2.1.1 (Latest version as of July 11 2023)
MacBook Pro 15-inch, 2019
macOS 13.4.1 (22F82)

Repro steps:
* File > New > Web XGA
* Select the paint brush tool and a basic round brush
* Create a pixel layer
* Hold down ctrl and option and click and drag left and right. Brush changes size.
* View > Rotate Left, repeat until view is rotated 90 degrees
* Hold down ctrl and option and click and drag left and right. Brush changes hardness.

Expected result: Left/right movement always adjusts brush size, independent of view rotation

Actual result: Adjustment depends on view rotation

* Reproduces regardless of hardware: built-in trackpad, mouse, wacom tablet, with and without external monitor
* Reproduces with hardware acceleration on and off (tried both)
* Also reproduces on iPad (using ctrl and option on command controller) (version

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-- Walt
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
    Desktop:  Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 

    Laptop:  Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
iPad:  iPad Pro M1, 12.9": iPadOS 17.3, Apple Pencil 2, Magic Keyboard 
Mac:  2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.3.1

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I agree, sounds like the same issue. Some clarifications that might not be apparent from the other issues with that tag:

  • This is a bug, not a feature request
  • It affects the latest version of Affinity Photo on both macOS and iOS
  • It reproduces reliably without any unusual hardware
  • It is a serious problem for painters, not a minor inconvenience
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Great, glad to hear it! I just realized that there is a related problem: the rotation of the brush itself also depends on the view angle (e.g. if I use one of the calligraphic pens). Is that also on the developers' radar?

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