Java Community | Help. Code. Learn.•3mo ago

Optimizing draw function for texured triangle

https://github.com/asdru22/3D-Graphics/blob/rasterization/src/main/java/geom/Triangle.java My current implementation basically implements a rasterization algorithm from scratch, which isn't very efficent. But i don't know how i would otherwise make a triangles texture rotate with it

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3D-Graphics/src/main/java/geom/Triangle.java at rasterization · asd...

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14 Replies

JavaBot•3mo ago

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asdruOP•3mo ago

If there's a better solution that involves built in functions im all ears but i couldn't find anything

asdruOP•3mo ago

i tried reducing the calls to the draw function by - grouping textures with the same color img 1 - combining the pixels in a new image and drawing that (img 2), this also looked worse

JavaBot•3mo ago

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asdruOP•3mo ago

 @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.BLACK);
        g2.fillRect(0, 0, getWidth(), getHeight());


        // Creazione del BufferedImage e del zBuffer
        BufferedImage img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
        double[] zBuffer = new double[img.getWidth() * img.getHeight()];
        Arrays.fill(zBuffer, Double.NEGATIVE_INFINITY);

        // Draw the scene
        //scene.draw(img,zBuffer);
        GrassBlock gblock = new GrassBlock(0, 0, 0);
        gblock.draw(img, zBuffer, new Camera(this.getWidth(), this.getHeight(), new Vertex(0, 500, 1000)));
        g2.drawImage(img, 0, 0, null);
    }

 @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.BLACK);
        g2.fillRect(0, 0, getWidth(), getHeight());


        // Creazione del BufferedImage e del zBuffer
        BufferedImage img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
        double[] zBuffer = new double[img.getWidth() * img.getHeight()];
        Arrays.fill(zBuffer, Double.NEGATIVE_INFINITY);

        // Draw the scene
        //scene.draw(img,zBuffer);
        GrassBlock gblock = new GrassBlock(0, 0, 0);
        gblock.draw(img, zBuffer, new Camera(this.getWidth(), this.getHeight(), new Vertex(0, 500, 1000)));
        g2.drawImage(img, 0, 0, null);
    }

do you know why this draws a cube but if i call the scene.draw method

public class RenderingScene {
    private final RenderingPanel renderingPanel;
    private Camera camera;
    private final ArrayList<Cube> cubes = new ArrayList<>();

    public RenderingScene(RenderingPanel renderingPanel) {
        this.renderingPanel = renderingPanel;
        this.camera = new Camera(renderingPanel.getWidth(), renderingPanel.getHeight(), new Vertex(0, 500, 1000));
        this.cubes.add(new GrassBlock(0, 0, 0));
        this.cubes.add(new Dirt(0, -100, 0));

    }

    public void update() {

    }

    public void draw(BufferedImage img, double[] zBuffer) {
        for (Cube cube : cubes) {
            cube.draw(img, zBuffer, camera);
        }
    }

}

public class RenderingScene {
    private final RenderingPanel renderingPanel;
    private Camera camera;
    private final ArrayList<Cube> cubes = new ArrayList<>();

    public RenderingScene(RenderingPanel renderingPanel) {
        this.renderingPanel = renderingPanel;
        this.camera = new Camera(renderingPanel.getWidth(), renderingPanel.getHeight(), new Vertex(0, 500, 1000));
        this.cubes.add(new GrassBlock(0, 0, 0));
        this.cubes.add(new Dirt(0, -100, 0));

    }

    public void update() {

    }

    public void draw(BufferedImage img, double[] zBuffer) {
        for (Cube cube : cubes) {
            cube.draw(img, zBuffer, camera);
        }
    }

}

it doesnt draw the cubes?

JavaBot•3mo ago

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rao•3mo ago

teixayo•3mo ago

Why dont you use OpenGL? You can even implement your custom algorithms on fragment shader

asdruOP•3mo ago

lets say its a personal challenge and im trying to learn 3d graphics i tried lwjgl too but didn't like it since ur working with ints

teixayo•3mo ago

It uses int for the addresses, in any library we have it... If you want to learn 3D graphics, you must know how these work. If you want faster rendering of triangles and cubes, I think the best choice is to go to openGL. If not, you can use multi threads and simp (special occasions) I think it's slow cause of creating a buffer for every rendering call. You should avoid creating this every frame

asdruOP•3mo ago

its not super slow so far i have 50 triangles on my screen and its still running at 60fps but i should test it further thanks for the advice!

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teixayo•3mo ago

I think at least you can render 1-5 milion triangles with your gpu(with ancient one) :kekw:

JavaBot•3mo ago

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Optimizing draw function for texured triangle

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