Test Cinder Ray / Plane Intersection

test_plane_intersectApp.cpp

#include "cinder/app/AppBasic.h"
#include "cinder/gl/gl.h"
#include "cinder/Rand.h"
#include "cinder/Camera.h"
#include "cinder/Perlin.h"

using namespace ci;
using namespace ci::app;
using namespace std;

class test_plane_intersectApp : public AppBasic {
public:
    
    void setup();
    void update();
    void draw();
    
    void mouseDown(MouseEvent e);
    
    CameraPersp camera;
    Perlin perlin;
    
    Vec3f plane_origin, plane_dir;
    Ray   test_ray;

};

void test_plane_intersectApp::setup()
{
    Rand::randomize();
    
    plane_origin = Rand::randVec3f();
    plane_dir    = Rand::randVec3f();
    
    camera.setPerspective(60, getWindowAspectRatio(), 0.01f, 10.0f);
    camera.lookAt(Vec3f(0, 0, 5), Vec3f::zero());
    
    test_ray.setOrigin(Vec3f(0, 2, 0));
}

void test_plane_intersectApp::update()
{
    test_ray.setDirection(Vec3f(
        perlin.noise(getElapsedSeconds(), 100),
        perlin.noise(getElapsedSeconds(), 200) - 1,
        perlin.noise(getElapsedSeconds(), 300)
    ).normalized());
}

void test_plane_intersectApp::draw()
{
    gl::clear(Color(0, 0, 0));
    
    gl::setMatrices(camera);
    
    gl::color(Colorf(0.5, 0.5, 0));
    gl::drawVector(test_ray.getOrigin(), test_ray.getOrigin() + test_ray.getDirection());
    
    float t;
    test_ray.calcPlaneIntersection(plane_origin, plane_dir, &t);
    gl::color(Colorf(1, 1, 0));
    gl::drawSphere(test_ray.calcPosition(t), 0.05f);
    
    gl::color(Colorf(1, 1, 1));
    gl::pushModelView();
    gl::multModelView(Matrix44f::createTranslation(plane_origin) * Matrix44f::alignZAxisWithTarget(plane_dir, Vec3f::yAxis()));
    gl::drawStrokedRect(Rectf(-1, -1, 1, 1));
    gl::drawCoordinateFrame();
    gl::popModelView();
}

void test_plane_intersectApp::mouseDown(MouseEvent e)
{
    plane_origin = Rand::randVec3f();
    plane_dir    = Rand::randVec3f();
}

CINDER_APP_BASIC(test_plane_intersectApp, RendererGl)