PGraphics and PeasyCam

Answers

• Chrisir

  February 2018

  cam.getState().apply(canvas);
• vjjv

  February 2018

  im sorry @Chrisir but canvas is not a field in my code. if i try with

    cam.getState().apply(buffer);
      cam.beginHUD();
      image(buffer, 0,0);
      cam.endHUD();
  

  it works fine (shader apply in buffer and camera transformations also) but if i try:

  cam.getState().apply(buffer2); 
      cam.beginHUD();
      image(buffer2, 0,0);
      cam.endHUD();
  

  buffer2 shows like a 2D screen in 3D space and camera transformations apply but not in that buffer.
• Chrisir

  February 2018

  I took it from the github discussion

  I don’t know
• vjjv

  February 2018

  edit 1: new results but not resolve yet:

  PShader sh;
  PShader sha;
  
  PGraphics buffer;
  PGraphics buffer2;
  
  
  
  import com.hamoid.*;
  import themidibus.*;
  import peasy.*;
  import peasy.org.apache.commons.math.*;
  import peasy.org.apache.commons.math.*;
  
  PeasyCam cam;
  float count;
  
  void settings () {
  
    fullScreen(P3D);
  }
  
  void setup(){
  
  background(0);
  
  
    cam = new PeasyCam(this, 500);
  
  
    sh = loadShader("basicShaderFrag.glsl", "basicShader.glsl");
    sha = loadShader("frag2.glsl", "basicShader.glsl");
  
   buffer = createGraphics(width, height, P3D);
   buffer2 = createGraphics(width, height, P3D);
  
  }
  
  void draw(){
  
      background(0);
       // println(frameRate);
      count +=0.005;
      sh.set("u_time", count);
  
      buffer.beginDraw();
      render(buffer);
      buffer.endDraw();
  
      buffer2.beginDraw();
      buffer2.shader(sh);
      buffer2.image(buffer,0, 0);
      buffer2.endDraw();
  
      cam.beginHUD();
      image(buffer2, 0,0);
      cam.endHUD();
  
  }
  
  
  void render(PGraphics a){
    cam.getState().apply(a);  // change here.
    a.background(0, 50);
  
    a.noStroke();
    s.run(); 
     a.sphere(200);
  }
  

  and in both shaders: #define PROCESSING_TEXTURE_SHADER. the transformations do in the buffer2 but don't draw geometry (it apply the shader to the full screen). if i define #define PROCESSING_COLOR_SHADER the geometry is draw but is only white.
• cansik

  February 2018

  You have to create a simple example, with just the things that are needed to reproduce the problem. You have a s.run(); in your code, which is not even declared. Otherwise it is really hard to help you and takes too much time.

  And please share the whole sketch, also the shaders.
• cansik

  February 2018

  Because I am a very kind person, I fixed the missing parts and created this very small example.

  The problem you had was, that you tried to draw a texture with a shader onto a P3D graphics object, which is possible, but with weird results. For a multipass texture shader you should use a P2D texture.

  To apply the pease cam matrix to the rendered scene, you have to use the already mentioned command cam.getState().apply(buffer);.

  Oh and just for the next time: I recommend to not use a sphere as object to which is placed in the center of peasycam to check if the view matrix is applied correctly. A box gives you a better feeling of the scene.

  Here the solution (just add your shaders again):

  import peasy.*;
  
  PGraphics buffer;
  PGraphics buffer2;
  
  PeasyCam cam;
  
  void settings () {
    size(500, 500, P3D);
  }
  
  void setup() {
    cam = new PeasyCam(this, 500);
  
    buffer = createGraphics(width, height, P3D);
    buffer2 = createGraphics(width, height, P2D);
  }
  
  void draw() {
    background(0);
  
    buffer.beginDraw();
    render(buffer);
    buffer.endDraw();
  
    cam.getState().apply(buffer);
  
    buffer2.beginDraw();
    buffer2.background(0);
    buffer2.image(buffer, 0, 0);
    buffer2.endDraw();
  
    cam.beginHUD();
    image(buffer2, 0, 0);
    cam.endHUD();
  }
  
  
  void render(PGraphics a) {
    a.background(0, 50);
    a.stroke(0, 255, 0);
    a.strokeWeight(3f);
    a.noFill();
    a.box(200);
  }