Method checkSphereInFrustum

Source/Graphics/camera.cpp:639–654

Check if a sphere is visible

// Check if a sphere is visible
int Camera::checkSphereInFrustum(vec3 where, float radius) const {
    int sphere_in_frustum = 2;
    for (auto frustumPlane : frustumPlanes) {
        float d =
            frustumPlane[0] * where.x() +
            frustumPlane[1] * where.y() +
            frustumPlane[2] * where.z() +
            frustumPlane[3];
        if (d <= -radius) {
            return 0;  // Sphere is entirely outside one of the frustum planes
        } else if (d < radius) {
            sphere_in_frustum = 1;  // Sphere is intersecting a frustum plane
        }
    }
    return sphere_in_frustum;
}

#if defined(USE_SSE)
static __m128 simd_dot_product(__m128 x1, __m128 y1, __m128 z1, __m128 x2, __m128 y2, __m128 z2) {