[REPORTED] PMatrix3D cannot be cast to PMatrix2D

Processing
1

Hello forum

I’ve run into an unexpected exception while trying to rotate a PShape in the Z axis, even though it works fine in the X and Y axis. Has anyone else gotten this problem? It only started happening after installing 3.5 (3.5.1 and 3.5.2)

I believe this code used to work fine

PShape shape;
void setup(){
size(500,500,P3D);
shape = createShape(SPHERE,50);
}
void draw(){
 background(100);
 fill(255);
 noStroke();
 shape.rotateX(.2);
 println("success X");
 shape.rotateY(.2);
 println("success Y");
 shape.rotateZ(.2);
 println("success Z");
 translate(width/2.0,height/2.0);
 shape(shape);
}

the exception:

ClassCastException: processing.core.PMatrix3D cannot be cast to processing.core.PMatrix2D

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2

Oddly enough, I ran another sketch and used rotateZ by itself and it works fine, the behavior seems to be limited to PShape’s rotateZ function…

Seems like a nasty bug that should be reported to github!

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3

I’ve reported it: https://github.com/processing/processing/issues/5770

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4

I ran into this issue as well with some old code (see last post):
PShape rotations and translations…

Workaround for P3D:

//  s2.rotate(heading);              // Generates error in Processing 3.5.3   
  s2.rotate(heading, 0, 0, 1);     // Workaround for P3D

I also tried P2D and some rotations were not correct for PShapes.
Workaround for P2D:

  s2.translate(-10, -10);    
  s2.rotate(heading);   
  shape(s2, v1.x, v1.y); 
//  s2.resetMatrix();               // Shapes no longer rotating correctly!
  s2.rotate(-heading);              // Workaround for P2D Rotated back...
  s2.translate(10, 10);             // Workaround for P2D Translated back..

Also box() in P2D did not display with console message “box() is not available with this renderer.”
Fix:

// box(20, 20, 0);          // Does not display in P2D with console message 
rect(-10, -10, 20, 20);  // Works in P2D!

:slight_smile:

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