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Simple Paint — Devlog #01: GPU Brush Stamps

· 約1分
Thang Le
Thang Le
Senior Lead Engineer

Simple Paint — brush stamps

Vigil № 0001 — Simple Paint. Picking up dev log notes for the painting tool after a long quiet stretch.

What changed in 2.0.1​

  • Brush stamps now sample a texture instead of solid colour. Texture array, indexed by brush id.
  • The compute kernel runs on a render texture target now, not a CPU Texture2D. ~14x faster on the Pixel 7.
  • Pressure curve is a AnimationCurve baked to a 256-entry LUT each frame the curve changes. No per-stamp evaluation cost.

Known issues​

  • Stamp seams visible when the user paints faster than the stamp spacing. Need to interpolate stamp positions between input samples.
  • Eraser is a colour brush right now. Real alpha erasing is the next pass.

The version on the Asset Store is still 2.0.0. Next push: brush spacing fix + the alpha eraser.