Drawing the same SVG with different stroke weights causes rendering bug with P2D renderer

Created by: cadin

Description

When drawing an SVG shape (with style disabled) using the P2D renderer, the rendering will glitch if the shape is drawn more than once with a different stroke weight.

Expected Behavior

The shape should appear on the canvas at different stroke weights.

Current Behavior

The first instance of the shape appears as expected. Subsequent shapes (drawn after changing strokeWeight) are drawn with a glitched stroke.

Steps to Reproduce

1. Set up sketch with P2D renderer.
2. Load an SVG into a PShape and call disableStyle() on it.
3. Draw the shape to the screen once, then change strokeWeight and draw again.

Example code (from this repo with SVG file included):

PShape aSVG;

void setup() {
  size(600, 300, P2D); // changing to default renderer works

  aSVG = loadShape("A.svg");
  aSVG.disableStyle();
}

void draw() {
  background(255);
  scale(3);

  strokeWeight(1);
  shape(aSVG); // removing this first shape works

  strokeWeight(3); // removing this stroke change works
  shape(aSVG, 100, 0);
}

Your Environment

• Processing version: 4.3
• Operating System and OS version: Mac OS 14.2.1 (Intel)

Workarounds

• Using the default renderer works as expected
• Drawing the shape only once (with any stroke weight) works as expected
• Drawing the shape multiple times without changing stroke weight works as expected
• Loading the same SVG into a separate PShape instance to render as the second graphic works as expected

Commencez par le sketch P2D fourni et sa reproduction en SVG, puis suivez le traitement par le renderer P2D des dessins répétés de PShape avec disabled-style et des valeurs de strokeWeight changeantes. Confirmez la correction en reproduisant le sketch et en vérifiant que les deux formes rendues utilisent les valeurs de strokeWeight demandées, sans artefacts.