problem with fill non-convex shape in P3D mode

tulai

Hi, all

I am trying to draw a flat non-convex custom shape and fill it in P3D mode in javascript mode.

e.g.

void setup(){
  size(500,500,P3D);
  }
void draw(){
  background(255);
  fill(255,0,0);
  beginShape();
  vertex(100,100,0);
  vertex(100,200,0);
  vertex(150,300,0);
  vertex(160,300,0);
  vertex(110,200,0);
  vertex(110,100,0);
  endShape(CLOSE);  
}

However, it shows ok in java mode or p2d jsmode, but display abnormal in p3d jsmode. They look like these.

Is there any way to fix these in p3d javascript mode?

Thanks