Error of shape optimization

[kaktus089123]

Most appropriate sub-area of Processing 4?

Core/Environment/Rendering, OpenGL, Export

Processing version

5/4.3.1/3.5.4

Operating system

Windows/Android

Steps to reproduce this

"1.Use alpha in color of fill(). It start can be visible.

2.3D primitives or obj models."

snippet

// Paste your code below :)

void setup() {
fullScreen(P3D);
}

void draw() {
background(0);
rotateY(PI/180*frameCount);
fill(255,50);
box(100);
//or obj model
}

Additional context

Fix it in p3 and p4 please. I making programs for old windows and android versions. And in p4 doesn't load and save files in play mode and released app.

[hx2A]

I tried running the code to see if I could understand what is happening here. When the cube has a partial transparency, there are inconsistencies in how the cube looks as it rotates around. Here are two screenshots:

For every 90 degree rotation, the cube faces should have identical colors. Based on the position of the cube in the above two images, they should look the same. @kaktus089123 , is this the problem you are observing?

I've worked closely with the cube() code before and remember suspecting there was a bug. Let me check my notes and see if it is relevant to this issue.

[hx2A]

I looked at this closer and realized I need to add a rendering hint so that the partially transparent box is rendered correctly.

void setup() {
  size(500, 500, P3D);
  hint(DISABLE_DEPTH_MASK);  // <- add this line
}

void draw() {
  background(0);
  translate(250, 250);
  rotateY(PI/180*frameCount);
  fill(255, 50);
  box(100);
}

You can read more about hint() in the reference docs.

Using that hint is important when there are partially transparent objects.

@kaktus089123 , does this address your issue?