---
title: "PxrDirectLighting"
canonical: "https://rmanwiki-25.pixar.com/space/REN25/20416414/PxrDirectLighting"
format: markdown
---
This is a debugging or "draft-quality" integrator that implements only the direct lighting portion of the light transport. *It is not designed to produce "final-quality" images.* Since it doesn't implement indirect lighting paths it cannot produce reflections, refractions, or other global illumination effects, nor can it handle any effects that require a volume integrator.
### Parameters
| **Parameter** | **Description** |
| --- | --- |
| **int numLightSamples** | Controls the number of light samples for direct illumination per camera hit point. The default is 4. |
| **int numBxdfSamples** | Controls the number of Bxdf samples for direct illumination per camera hit point. The default is 4. |
### Standard AOVs
On top of regular LPE-based AOVs, this integrator outputs a number of standard AOVs typically used by compositors.
| **Declaration** | **Contents** | **Channels** |
| --- | --- | --- |
| color __Pworld | P in world-space | __Pworld.r : x component
__Pworld.g : y component
__Pworld.b : z component |
| color __Nworld | Nn in world-space | __Nworld.r : x component
__Nworld.g : y component
__Nworld.b : z component |
| color __depth | Multi-purpose AOV | __depth.r : depth from camera in world-space
__depth.g : height in world-space
__depth.b : geometric facing ratio : abs(Nn.V) |
| color __st | Texture coords | __st.x : s
__st.y : t
__st.z : 0.0 |
| color __Pref | Reference Position primvar (if available) | __Pref.r : x component
__Pref.g : y component
__Pref.b : z component |
| color __Nref | Reference Normal primvar (if available) | __Nref.r : x component
__Nref.g : y component
__Nref.b : z component |
| color __WPref | Reference World Position primvar (if available) | __WPref.r : x component
__WPref.g : y component
__WPref.b : z component |
| color __WNref | Reference World Normal primvar (if available) | __WNref.r : x component
__WNref.g : y component
__WNref.b : z component |