void MetavoxelSystem::render() {
// update the frustum
ViewFrustum* viewFrustum = Application::getInstance()->getViewFrustum();
_frustum.set(viewFrustum->getFarTopLeft(), viewFrustum->getFarTopRight(), viewFrustum->getFarBottomLeft(),
viewFrustum->getFarBottomRight(), viewFrustum->getNearTopLeft(), viewFrustum->getNearTopRight(),
viewFrustum->getNearBottomLeft(), viewFrustum->getNearBottomRight());
RenderVisitor renderVisitor(getLOD());
guideToAugmented(renderVisitor);
}
void DrawFrustum::getVertices(const ViewFrustum& frustum, glm::vec3 vertices[8]) {
vertices[0] = frustum.getNearTopLeft();
vertices[1] = frustum.getNearTopRight();
vertices[2] = frustum.getNearBottomRight();
vertices[3] = frustum.getNearBottomLeft();
vertices[4] = frustum.getFarTopLeft();
vertices[5] = frustum.getFarTopRight();
vertices[6] = frustum.getFarBottomRight();
vertices[7] = frustum.getFarBottomLeft();
}
void ConicalViewFrustum::set(const ViewFrustum& viewFrustum) {
// The ConicalViewFrustum has two parts: a central sphere (same as ViewFrustum) and a circular cone that bounds the frustum part.
// Why? Because approximate intersection tests are much faster to compute for a cone than for a frustum.
_position = viewFrustum.getPosition();
_radius = viewFrustum.getCenterRadius();
_farClip = viewFrustum.getFarClip();
auto topLeft = viewFrustum.getNearTopLeft() - _position;
auto topRight = viewFrustum.getNearTopRight() - _position;
auto bottomLeft = viewFrustum.getNearBottomLeft() - _position;
auto bottomRight = viewFrustum.getNearBottomRight() - _position;
auto centerAxis = 0.25f * (topLeft + topRight + bottomLeft + bottomRight); // Take the average
_direction = glm::normalize(centerAxis);
_angle = std::max(std::max(angleBetween(_direction, topLeft),
angleBetween(_direction, topRight)),
std::max(angleBetween(_direction, bottomLeft),
angleBetween(_direction, bottomRight)));
}