![]() For example, a “weak layer” with a default value will be masked by a stronger layer with animation. You can use the Layer Stack and Composition tabs of the Scene Graph Details pane to examine which layers contribute to the primitive, and how those different layers were composed together.Īttributes resolve according to “strongest wins” rules, so all values for any given attribute will be fetched from the strongest PrimSpec. Keeping track of how multiple levels of sublayering and referencing work together to generate the final opinion on a primitive at a single scene graph location can become complicated. The Graft Stages LOP is similar, but instead of referencing from a file, it inserts a branch into the scene graph tree from elsewhere in the LOP network. The Reference LOP and Stage Manager LOP create references. For a look at how LOP nodes generate USD, see how LOPs work. The following page explains the basics of USD, and relates them to how Solaris supports working with USD in Houdini. A basic understanding of USD concepts and features will make it much easier to understand LOPs. However, wherever possible LOP parameters use USD terminology, and are sometimes a thin wrapper around functionality built into USD. LOPs is designed so you don’t need to know about the underlying USD structure. ![]() In LOPs, each node accepts an incoming USD scene, modifies it, and outputs a new scene.īecause USD is a very comprehensive framework, it is not simple. LOP networks are slightly similar to SOPs, where each node accepts incoming geometry, modifies it, and outputs new geometry. Solaris includes USD support in the view and a new network type, LOPs (Light Operators). Houdini’s tooling and support for USD is collectively known as Solaris. This allows multiple departments to collaborate, share data, and update assets without interfering with each other. You can also replace one of the layers (for example a newer version of an asset or updated lighting) and automatically re-apply all existing changes on top of it. These edits won’t affect other people using the same scene unless they choose to include your new layer. You can start with an existing scene and create a new layer containing your edits. The main power of the layer paradigm is non-destructive editing. ![]() For example, a master USD file describing a kitchen scene ( d)might reference layer files containing props ( d, d), lighting, characters, and so on, composing them into a single stage. USD is a system of software and file formats for describing 3D scenes by composing layers. ![]()
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