float KRViewport::coverage(const KRAABB &b) const
{
if(!visible(b)) {
return 0.0f; // Culled out by view frustrum
} else {
KRVector3 nearest_point = b.nearestPoint(getCameraPosition());
float distance = (nearest_point - getCameraPosition()).magnitude();
KRVector3 v = KRMat4::DotWDiv(m_matProjection, getCameraPosition() + getCameraDirection() * distance);
float screen_depth = distance / 1000.0f;
return KRCLAMP(1.0f - screen_depth, 0.01f, 1.0f);
/*
KRVector2 screen_min;
KRVector2 screen_max;
// Loop through all corners and transform them to screen space
for(int i=0; i<8; i++) {
KRVector3 screen_pos = KRMat4::DotWDiv(m_matViewProjection, KRVector3(i & 1 ? b.min.x : b.max.x, i & 2 ? b.min.y : b.max.y, i & 4 ? b.min.z : b.max.z));
if(i==0) {
screen_min = screen_pos.xy();
screen_max = screen_pos.xy();
} else {
if(screen_pos.x < screen_min.x) screen_min.x = screen_pos.x;
if(screen_pos.y < screen_min.y) screen_min.y = screen_pos.y;
if(screen_pos.x > screen_max.x) screen_max.x = screen_pos.x;
if(screen_pos.y > screen_max.y) screen_max.y = screen_pos.y;
}
}
screen_min.x = KRCLAMP(screen_min.x, 0.0f, 1.0f);
screen_min.y = KRCLAMP(screen_min.y, 0.0f, 1.0f);
screen_max.x = KRCLAMP(screen_max.x, 0.0f, 1.0f);
screen_max.y = KRCLAMP(screen_max.y, 0.0f, 1.0f);
float c = (screen_max.x - screen_min.x) * (screen_max.y - screen_min.y);
return KRCLAMP(c, 0.01f, 1.0f);
*/
}
}
float KRReverbZone::getContainment(const Vector3 &pos)
{
AABB bounds = getBounds();
if(bounds.contains(pos)) {
Vector3 size = bounds.size();
Vector3 diff = pos - bounds.center();
diff = diff * 2.0f;
diff = Vector3::Create(diff.x / size.x, diff.y / size.y, diff.z / size.z);
float d = diff.magnitude();
if(m_gradient_distance <= 0.0f) {
// Avoid division by zero
d = d > 1.0f ? 0.0f : 1.0f;
} else {
d = (1.0f - d) / m_gradient_distance;
d = KRCLAMP(d, 0.0f, 1.0f);
}
return d;
} else {
return 0.0f;
}
}
KRVector3 KRAABB::nearestPoint(const KRVector3 & v) const
{
return KRVector3(KRCLAMP(v.x, min.x, max.x), KRCLAMP(v.y, min.y, max.y), KRCLAMP(v.z, min.z, max.z));
}
