Render Pass
 | Set Pass | This node defines a specific render pass. |
 | Filter Pass | This node checks if a specific render pass is set and allows or stops further hierarchy tree traversing. |
The render pass functionality in Ventuz can be used to render glows, reflections or other effects that need multi-pass rendering. One task could be to build a Glow-Head container so that certain parts of the subtree beneath the container could be rendered with a glow.
There are two nodes which have to be used in combination to create render passes. The Set Pass node defines a new render pass. It posses two properties: The DefaultFilter property defines the initial state of a new Filter Pass node. RenderUnfiltered specifies if subtrees beneath a Set Pass node, which are not assigned to a certain render pass by a Filter Pass node, should be rendered anyhow. The Filter Pass node determines in which render passes a scene subtree should be rendered. For every superior Set Pass node the Filter Pass node has an according property with the name of the Set Pass node. These properties can be set to three values:
| Off | The subtree is only rendered if the according Set Pass node was NOT traversed during a render pass. |
| On | The subtree is only rendered if the according Set Pass node was traversed during a render pass. |
| Ignore | The subtree is rendered in both cases/passes. |
In the screen-shot below a glow effect was assigned to text objects. The glow is rendered in a separate render pass. Depending on the settings of the Filter Pass node only text, only glow or both, text and glow, are rendered.
A possible scene setup for such a multi pass rendering is shown in the figure below. The GlowHead container has two linked Outputs: one for the normal pass and one for the glow pass. The normal 'blue' pass is traversed if the Filter Pass node is set to Off or Ignore. The 'yellow' glow pass is traversed if the Filter Pass node is set to On or Ignore.
