QVariantMap Camera::getViewFrustum() {
ViewFrustum frustum;
loadViewFrustum(frustum);
QVariantMap result;
result["position"].setValue(frustum.getPosition());
result["orientation"].setValue(frustum.getOrientation());
result["projection"].setValue(frustum.getProjection());
result["centerRadius"].setValue(frustum.getCenterRadius());
result["fieldOfView"].setValue(frustum.getFieldOfView());
result["aspectRatio"].setValue(frustum.getAspectRatio());
return result;
}
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)));
}