void camera::view_all(aabb const& box, vec3 const& up)
{
float diagonal = length(box.size());
float r = diagonal * 0.5f;
vec3 eye = box.center() + vec3(0, 0, r + r / std::atan(fovy_));
look_at(eye, box.center(), up);
}
aap::aap(const aabb &total)
{
VEC3F center = total.center();
char xyz = 2;
if (total.width() >= total.height() && total.width() >= total.depth()) {
xyz = 0;
} else
if (total.height() >= total.width() && total.height() >= total.depth()) {
xyz = 1;
}
this->xyz = xyz;
this->p = center[xyz];
}
void calcDepthRange(mat4 const& pr, mat4 const& mv,
aabb const& bbox, float& minval, float& maxval)
{
vec3 center = vec4( mv * vec4(bbox.center(), 1.0f) ).xyz();
vec3 min = vec4( mv * vec4(bbox.min, 1.0f) ).xyz();
vec3 max = vec4( mv * vec4(bbox.max, 1.0f) ).xyz();
float radius = length(max - min) * 0.5f;
// Depth buffer of ibrPlanes
vec3 scal(center);
scal = normalize(scal) * radius;
min = center - scal;
max = center + scal;
vec4 min4 = pr * vec4(min, 1.f);
vec4 max4 = pr * vec4(max, 1.f);
min = min4.xyz() / min4.w;
max = max4.xyz() / max4.w;
minval = (min.z+1.f) * 0.5f;
maxval = (max.z+1.f) * 0.5f;
}