Examples with Box org.lwjgl.demo.opengl.util.KDTree.Box used on opensource projects

Example 1 with Box

use of org.lwjgl.demo.opengl.util.KDTree.Box in project lwjgl3-demos by LWJGL.

the class DemoSsboTrianglesStacklessKdTree method createSceneSSBO.

/**
 * Build the kd-tree of the scene and create two SSBOs:
 * <ul>
 * <li>one for the nodes of the kd-tree
 * <li>and another one to hold all the triangles stored in the leaf nodes of the kd-tree
 * </ul>
 */
void createSceneSSBO() {
    /* Build Kd-tree */
    KDTree kdtree = new KDTree();
    List<Triangle> triangles = new ArrayList<Triangle>();
    int trianglesCount = mesh.positions.remaining() / 3 / 3;
    sceneBounds = new Box();
    Vector3f min = new Vector3f(Float.MAX_VALUE, Float.MAX_VALUE, Float.MAX_VALUE);
    Vector3f max = new Vector3f(-Float.MAX_VALUE, -Float.MAX_VALUE, -Float.MAX_VALUE);
    sceneBounds.min = min;
    sceneBounds.max = max;
    for (int i = 0; i < trianglesCount; i++) {
        Triangle t = new Triangle();
        t.v0 = new Vector3f(mesh.positions.get(i * 3 * 3 + 0), mesh.positions.get(i * 3 * 3 + 1), mesh.positions.get(i * 3 * 3 + 2));
        t.v1 = new Vector3f(mesh.positions.get(i * 3 * 3 + 3), mesh.positions.get(i * 3 * 3 + 4), mesh.positions.get(i * 3 * 3 + 5));
        t.v2 = new Vector3f(mesh.positions.get(i * 3 * 3 + 6), mesh.positions.get(i * 3 * 3 + 7), mesh.positions.get(i * 3 * 3 + 8));
        triangles.add(t);
        min.min(t.v0).min(t.v1).min(t.v2);
        max.max(t.v0).max(t.v1).max(t.v2);
    }
    kdtree.buildTree(triangles, sceneBounds);
    DynamicByteBuffer nodesBuffer = new DynamicByteBuffer();
    DynamicByteBuffer trianglesBuffer = new DynamicByteBuffer();
    kdTreeToBuffers(kdtree, nodesBuffer, trianglesBuffer);
    nodesBuffer.flip();
    trianglesBuffer.flip();
    this.nodesSsbo = glGenBuffers();
    glBindBuffer(GL_ARRAY_BUFFER, nodesSsbo);
    glBufferData(GL_ARRAY_BUFFER, nodesBuffer.bb, GL_STATIC_DRAW);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    this.trianglesSsbo = glGenBuffers();
    glBindBuffer(GL_ARRAY_BUFFER, trianglesSsbo);
    glBufferData(GL_ARRAY_BUFFER, trianglesBuffer.bb, GL_STATIC_DRAW);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
}