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HE_Mesh library: getClosestPoint()

brainwashedbrainwashed
edited June 2015 in Library Questions

I´m tying to make a sketch that "project" on a HE_Mesh mesh any random external point, any point located out of the mesh surface. Does anybody know which can be the better way?

I tried the HE_Mesh method : getClosestPoint (final WB_Point p, final WB_KDTree< WB_Point, Long > vertexTree)

So given any query point like:

WB_Point randomPoint;

And given a vertexTree, KD-tree from myMesh (from vertexTree()) that returns a KD-tree containing all vertices. WB_KDTree<WB_Coordinate, Long> myVertexTree = mesh.getVertexTree();

Then I get trouble trying to make a sentence like this:

WB_Point myClosestPoint = mesh.getClosestPoint(randomPoint, myVertexTree);

The problem is that the method getClosestPoint ( WB_Point , WB_KDTree<WB_Point, Long > ) in the type HE_Mesh is not applicable for the arguments WB_KDTree <WB_Coordinate, Long>

Is there any method like getVertexTree() that returns a WB_KDTree<WB_Point, Long>, or how can I translate the WB_KDTree<WB_Coordinate, Long> into a WB_KDTree<WB_Point, Long>

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Answers

  • brainwashedbrainwashed

    Here´s an example:

        HE_Mesh mesh;
    WB_Render render;
    WB_Point randomPoint;
    WB_Point pointOnSurface;

    float sizeWorld = 300;

    public void setup() {
        size(800, 800, OPENGL);
        smooth(8);
        randomPoint = new WB_Point(random(sizeWorld), random(sizeWorld), random(sizeWorld));
        HEC_Sphere creator=new HEC_Sphere();
        creator.setRadius(100).setUFacets(32).setVFacets(32);
        mesh=new HE_Mesh(creator); 
        render=new WB_Render(this);

        // getting the projection point on the surface
        WB_KDTree<WB_Coordinate, Long> myVertexTree = mesh.getVertexTree();
        pointOnSurface = mesh.getClosestPoint(randomPoint, myVertexTree);
        //  
    }

    public void draw() {
        background(255);
        directionalLight(255, 255, 255, 1, 1, -1);
        directionalLight(127, 127, 127, -1, -1, 1);
        translate(400, 400, 100);
        rotateY(mouseX*1.0f/width*TWO_PI);
        rotateX(mouseY*1.0f/height*TWO_PI);
        stroke(0,100);
        render.drawEdges(mesh);
        stroke(255,10,10);
        render.drawPoint(randomPoint,5);
        render.drawPoint(pointOnSurface,5);

    }
  • brainwashedbrainwashed

    I realized that the getFaceTree() method gets back a WB_KDTree <WB_Point, Long>. ( instead of the getVertexTree()that returns a WB_KDTree<WB_Coordinate, Long>) But any query gives a null... What I am doing wrong?

    For example:

    public class HeMeshProjectOnSphere extends PApplet {

    PeasyCam cam;
    HE_Mesh mesh;
    WB_Render render;
    WB_Point randomPoint;
    WB_Point pointOnFace;
    HE_Vertex pointOnVertex;

    float sizeWorld = 300;

    public void setup() {
        size(800, 800, OPENGL);
        cam = new PeasyCam(this, 500);
        render=new WB_Render(this);
        smooth(8);

        HEC_Sphere creator=new HEC_Sphere();
        creator.setRadius(100).setUFacets(32).setVFacets(32);
        mesh=new HE_Mesh(creator); 

        randomPoint = new WB_Point(random(sizeWorld), random(sizeWorld), random(sizeWorld));

        // trying to get the projection point on a mesh (face, vertex,...)
        WB_KDTree <WB_Point, Long> myFaceTree = mesh.getFaceTree();
        pointOnFace = mesh.getClosestPoint(randomPoint, myFaceTree);    
        pointOnVertex = mesh.getClosestVertex(randomPoint, myFaceTree);

        println(myFaceTree.toString());
        println (pointOnFace);
        println (pointOnVertex);
    }

    public void draw() {
        background(255);

        stroke(0,100);
        render.drawEdges(mesh);

        stroke(255,10,10);
        render.drawPoint(randomPoint,5);
        if (pointOnFace != null) render.drawPoint(pointOnFace,5);   
        if (pointOnVertex != null) render.drawPoint(pointOnVertex,5);
    }
  • brainwashedbrainwashed

    Solved by the author of HE_Mesh in the v 2.0.14. Thanks Frederick Vanhoutte !! ^:)^

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