glm::vec2 Servo2D::redrawLaser() {
// Return (-1, -1) if the laser doesn't intersect z=0
glm::vec2 result = glm::vec2(-1.0, -1.0);
// Convert to prism coordinates
glm::vec3 position = glm::inverse(prism_->getTransform()) * glm::vec4(controller_position_, 1.0f);
glm::quat orientation = glm::inverse(prism_->getRotation()) * controller_orientation_;
// 1m in the direction of the controller
glm::vec3 direction = orientation * glm::vec3(0.0f, 0.0f, -1.0f);
// The endpoint of the laser, in prism coordinates
glm::vec3 endpoint = position + direction * LASER_LENGTH;
// The laser color
glm::vec4 color = glm::vec4(1.0, 0.0, 0.0, 1.0);
// Does the laser intersect z=0?
if ((position.z > 0) && (endpoint.z < 0)) {
// How far along the laser did it intersect?
float ratio = 1.0 / (1.0 - (endpoint.z / position.z));
// The intersection point
glm::vec3 intersection = ((1 - ratio) * position) + (ratio * endpoint);
// Is the intersection inside the viewport?
result = viewportPosition(intersection);
if (pointInsideViewport(result)) {
color = glm::vec4(0.0, 1.0, 0.0, 1.0);
endpoint = intersection;
}
}
laser_->clearPoints();
laser_->addPoints(position);
laser_->addPoints(endpoint);
laser_->setColor(color);
return result;
}
void RiftGlfwApp::viewport(ovrEyeType eye) {
const glm::uvec2 & windowSize = getSize();
glm::ivec2 viewportPosition(eye == ovrEye_Left ? 0 : windowSize.x / 2, 0);
GlfwApp::viewport(glm::uvec2(windowSize.x / 2, windowSize.y), viewportPosition);
}
