Method
RT Mirror Reflection is the fastest raytracing reflections node with only a single, sharp ray traced bounce supported.
This can be used to simulate mirrors, reflections and specular on any raytracing enabled specular material/surface. Rough reflections can be approximated using the blurring properties.
As it only uses one bounce, secondary bounces such as a mirror reflecting another mirror will not work. This node is best-used for scenes that need to run more optimally at higher framerates.
*Raytracing will need to be enabled on the root node for the RT Mirror Reflection node to work.
*Raytraced reflections will need to be enabled on the material node of 3D objects that will utilise raytraced mirror reflections.
*Because Roughness Blur is a post approximation of roughness, the effect can look different at different scene scales. It’s recommended to use the blur scale property to correct these differences.
| A scene using RT Mirror Reflections |
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| A scene using RT Mirror Reflections |
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Sample
| RT Mirror Reflection node |
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RT_MirrorReflection.dfx
This sample uses light-baked assets in the scene.
| RT Mirror Reflection example nodegraph |
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Attributes
| Name |
Description |
|---|
| Path Tracer Shader |
Import a shader source code file as a resource. |
| Denoising / Refinement |
Toggles on and off denoising / refinement. |
| Ray Bias |
Sets the bias of the rays. |
| Sample clamp |
Clamps the reflectiveness of the rays. |
| Run at Reduced Resolution (Faster) |
Halves the rays used in ray tracing, dramatically increasing performance in some scenes. |
Blur
| Name |
Description |
|---|
| Blur Reflections |
When enabled, Notch will attempt to generate approximate reflections using a post blur pass on the mirror reflections. |
| Blur Quality |
Increases the number of samples taken for the post blur. |
| Blur Scale |
Adjusts the scale of the blur. Best used to correct the blur pass for scene scale. |
Environment Map
| Name |
Description |
|---|
| Environment Brightness |
The brightness of the environment map. |
| Environment Specular |
Toggles on and off environment specular. |
| Environment Filtering |
Toggles on and off environment filtering. |
Inputs
| Name |
Description |
Typical Node Input |
|---|
| Object Nodes |
Only reflect particular objects in the scene. Great for making vampires. |
3D Object |
| Fast-Path Specular Sky Lights |
Sky lights linked to this input will have their specular component traced by the RT Mirror Reflection node as a mirror reflection ray, instead of in the Sky Light’s direct illumination pass. This allows the result to be post-blurred with the RT Mirror Reflection’s blur pass, and is also faster as less rays need to be cast. |
Sky Lights |
Outputs
All nodes connected to this node are treated as if flowing to the parent node, and inherits any transformation changes along the chain.
