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    davemonster
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  • OPENGL Shadows
    Does anyone know of a simple example where OPENGL creates real-time shadows?

    I know this is possible, but I have no idea how to implement it. 

    Here is a good starting point:

    2. import processing.opengl.*;

    4. void setup() {
    5. size(400, 400, OPENGL);
    6. camera(300, 300, 150, 100, 100, 50, 1, 1, 0);
    7. smooth();
    8. noStroke();
    9. }

    11. void draw() {
    12. rotateZ(frameCount/30.5);
    13. background(0);
    14. directionalLight(255, 255, 255, 0, -200, -100);
    15. fill(255);
    16. rect(-150, -150, 300, 300);
    17. sphere(50);
    18. //imitation shadow
    19. fill(10,100); translate(0,0,1); ellipse(0,-25,100,120); translate(0,0,-1);
    20. }
  • GLModel Line Width
    Hello,

    I am using the GLModel library to make a model with several thousand lines ( example here). I am trying to make some lines appear thicker than others within the same model. 

    I saw the setLineWidth() function and like how it expands the line cylindrically. Unfortunately, it increases the size of all lines in the model. I saw the  linearComb() function from the PDBView example, but I could not figure out how to use it. Is there a way to increase the width of only certain lines within the model?

    Thank you so much for your help!!

    Dave
  • Efficient Rendering of Multiple Lines
    Hello,

    I am drawing over 30,000 lines and want to make the rendering process more efficient. When I rotate the stage in 3D, I currently have to re-draw every singe line, which causes heavy lags.

    I know theres got to be a more efficient way to do this, and I was hoping you might have some advice.

    Thanks you so much for your time and input!



    Below is a simple sketch that illustrates the re-draw inefficiency:

    1. //the hairy cube, dderiso@ucsd.edu, 2011

    3. import peasy.*;
    4. PeasyCam cam; //should i be using this?

    6. int screen_size = 800;
    7. int lines_max = 50000; //number of lines
    8. int[] lines_x1 = new int[lines_max];
    9. int[] lines_y1 = new int[lines_max];
    10. int[] lines_z1 = new int[lines_max];
    11. int[] lines_x2 = new int[lines_max];
    12. int[] lines_y2 = new int[lines_max];
    13. int[] lines_z2 = new int[lines_max];

    15. void setup() 
    16. {
    17.       size(screen_size, screen_size, P3D);
    18.       colorMode(HSB, 100);
    19.       cam = new PeasyCam(this, 2000);
    20.       strokeWeight(3);
    22.       //assign random xyz values for each vertex pair
    23.       for(int i=0; i<lines_max; i++)
    24.       {
    25.             lines_x1[i] = (int)random(-screen_size, screen_size);
    26.              lines_y1[i] = (int)random(-screen_size, screen_size);
    27.              lines_z1[i] = (int)random(-screen_size, screen_size);
    28.             lines_x2[i] = (int)random(-screen_size, screen_size);
    29.              lines_y2[i] = (int)random(-screen_size, screen_size);
    30.              lines_z2[i] = (int)random(-screen_size, screen_size);
    31.       }
    32. }

    34. void draw()
    35. {
    36.       background(0);
    37.        lights();
    39.        //having to re-draw every line is inefficient
    40.        for(int i=0; i<lines_max; i++)
    41.        {
    42.             stroke(i % 100, 100, 100, 5); //change color
    43.              line(lines_x1[i],lines_y1[i],lines_z1[i],lines_x2[i],lines_y2[i],lines_z2[i]);
    44.       }
    45. }