Learning Trace Sets in Redshift with iRender
Trace Sets help in providing fine-grained control over which objects are visible through reflections and refractions. For example, you can use Trace Sets to limit the reflections on a specific object to a subset of the objects in the scene without affecting the reflections elsewhere in the scene. In today’s article, let’s explore Trace Sets in Redshift with iRender!
1. Exploring Trace Sets in Redshift
1.1 What are Trace Sets in Redshift?
A Trace Set is a set or a group of objects. Trace Sets can be set to be inclusive or exclusive for convenience:
- An inclusive Trace Set is a set of objects in the Trace Set.
- On the other hand, an exclusive Trace Set includes all objects in the scene except those in the Trace Set.
Reflection Trace Set
Consider the following example to better understand and visualize how Trace Sets work. The scene on the left is rendered without the use of Trace Sets. The same scene is rendered on the right, but with an Exclusive Trace Set containing the red box assigned to the reflective mirror wall’s “Reflection Trace Set” attribute.
Refraction Trace Set
In the following example, we have assigned an Exclusive Trace Set to the glass cube object’s ‘Refraction Trace Set’ attribute. The objects in the Exclusive Trace Set (the red box in this example) are not included in the refractions of the glass cube.
1.2 Creating Trace Sets
Tracesets are defined in Cinema 4D using the parameters available in Redshift Object Tags. After you’ve applied a tag to your desired object, you’ll see an Exclusion tab where you can control the reflection or refraction trace sets (the objects visible to this object’s reflection or refraction rays) of selected objects in your scene.
We will use a RedShift Object Tag on our selected object to create a Trace Set by right-clicking and applying the tag.
After applying the Redshift tag, we can begin Excluding and Including different objects from our current Object’s Reflection/Refraction. To view the Trace Set parameters, go to the Exclusion tab.
As illustrated in the above example, we will exclude the Red cube from being refracted by our Glass Cube. To begin, we’ll enable the trace set by selecting Override. We now need to specify which objects will be excluded from refraction. Simply drag and drop the red cube into the Objects box. All of the objects in our scene that can be refracted/reflected by our glass cube are now doing so, with the exception of our red cube, which is no longer refracted but can still be seen outside the cube.
We can use the icons next to our objects to enable or disable the Refraction and Reflection trace sets of specific objects in the Objects list. When enabled, the hierarchy symbol on the far right allows objects beneath the one holding the tag to inherit the same trace sets.
- 1 – Refraction
- 2 – Reflection
- 3 – Hierarchy
These options are enabled by default, but you can disable them. When you click on the icons, they will turn grey and the trace for this object will be disabled.
1.3 Trace Set Options
When a Trace Set is in exclusive mode, all objects in the scene except those in the Trace Set can see reflection or refraction rays. When a Trace Set is in inclusive mode, only the objects in the Trace Set can see reflection or refraction rays, while all other objects are excluded.
Reflection Exclusive & Inclusive Modes
Refraction Exclusive & Inclusive Modes
The Trace Set example below now employs “Inclusive Mode,” which excludes from the reflection all other objects in the scene except the red cube, including the ground plane and the glass cube itself. This may appears strange in some situations, but it is the correct response.
To make the result more “pleasing,” we must include the glass cube and ground plane in the Trace Set alongside the red cube. This removes the blue cube from the refraction while also accounting for refractions from the ground plane and the glass cube itself.
Note: When using Inclusive Mode on a refractive object’s Refraction Trace Set, make sure to include the refractive object itself or you will get unappealing results.
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Reference source: help.maxon.net
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