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Quellcode

public class RayPicker {
    public Vector3f currentRay;
    
    private Matrix4f projectionMatrix;
    private Matrix4f viewMatrix;
    private ViewCamera viewCamera;
    
    public RayPicker(ViewCamera viewCamera, Matrix4f projectionMatrix) {
        this.viewCamera = viewCamera;
        this.projectionMatrix = projectionMatrix;
        this.viewMatrix = MatrixMath.createViewMatrix(viewCamera);
    }
    
    public void tick() {
        viewMatrix = MatrixMath.createViewMatrix(viewCamera);
        currentRay = calculateMouseRay();
    }
    
    private Vector3f calculateMouseRay() {
        Vector4f clipCoords = new Vector4f(0, 0, -1, 1);
        Vector4f eyeCoords = toEyeCoords(clipCoords);
        return toWorldCoords(eyeCoords);
    }
    
    private Vector3f toWorldCoords(Vector4f eyeCoords) {
        Matrix4f invertedView = Matrix4f.invert(viewMatrix, null);
        Vector4f rayWorld = Matrix4f.transform(invertedView, eyeCoords, null);
        Vector3f mouseRay = new Vector3f(rayWorld.x, rayWorld.y, rayWorld.z);
        mouseRay.normalise();
        return mouseRay;
    }
    
    private Vector4f toEyeCoords(Vector4f clipCoords) {
        Matrix4f invertedProjection = Matrix4f.invert(projectionMatrix, null);
        Vector4f eyeCoords = Matrix4f.transform(invertedProjection, clipCoords, null);
        return new Vector4f(eyeCoords.x, eyeCoords.y, -1, 0);
    }
}

Quellcode

boolean picked = false;
                for (float i = 0; i < 10; i+=0.1f) {
                    Vector3f stop = new Vector3f(
                            viewCamera.getCameraPosition().x + level.levelCollisionPicker.currentRay.x * i + 0.5f,
                            viewCamera.getCameraPosition().y + level.levelCollisionPicker.currentRay.y * i + 0.5f,
                            viewCamera.getCameraPosition().z + level.levelCollisionPicker.currentRay.z * i + 0.5f
                        );
                    Tile pickedTile = level.getTile(stop);
                    if(pickedTile.block != Blocks.air) {
                        rayPickedTile = stop;
                        picked = true;
                        break;
                    }
                }
                if(!picked) rayPickedTile = null;