processing / processing/processing4

rotate a texture in PShape bug not but work not

Open
#621 2 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

help wanted opengl
Dominant language
Java
Stars
494
Forks
183
Avg merge
4h 39m
Merged PRs (30d)
3

Description

Created by: matheplica

Hi, here's a bug with last Processing version :

PMatrix2D uvtr = new PMatrix2D();
textUVA = new PVector(0, 0.5);
        textUVB = new PVector(0.25, 0.08);
        memUVA = new PVector(0, 0.5);
        memUVB = new PVector(0.25, 0.08);

void adaptTexture(){
       uvtr.reset();
        uvtr.translate(0.5, 0.5);
        uvtr.rotate(rotText);
        uvtr.translate(-0.5, -0.5);
        uvtr.mult(memUVA, textUVA);
        uvtr.mult(memUVB, textUVB);
        sh.setTextureUV(1, textUVA.x, textUVA.y);
        sh.setTextureUV(2, textUVB.x, textUVB.y);
}

Before I start to change the variable rotText like this:

ani = new Ani(this, time, "rotText", rotText+((PI/3)*sens), Ani.CIRC_OUT, "onUpdate:adaptTexture");

This part of code runs in P3 but not in P4.
There is no error message but it's append nothing.
In P3 the texture turn in the shape.

I'm on ubuntu 22.04

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the provided texture-rotation sketch in Processing 4 on Ubuntu 22.04, then compare its behavior with Processing 3. Trace the PShape texture UV path around setTextureUV() and the PMatrix2D transformations; done means the texture visibly rotates in Processing 4 without errors.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.