Giffer

Murray Stevenson, Image Engine’s resident Gaffer expert, has been curating an internal “Gaffer by GIF” page, highlighting lesser-known Gaffer features in 60 seconds or less. We’ve liberated as many as we can for this blog post, so check them out and give yourself a pat on the back if you knew them all already.

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Gaffer visits Welikia

Eric Mehl of Hypothetical has been busy using Gaffer’s procedural scene generation and rendering to recreate Welikia, the ecosystem of New York City before settlement by Europeans. There’s an overview of the work on Hypothetical’s website, and a discussion of the Gaffer workflow on their blog. Windows users might know Eric from his Herculean efforts to port Gaffer to Windows, and his integration of Deadline with Gaffer. Thanks for sharing, Eric!

Expression vs. Python Editor

It is common to prototype code in the Python Editor, and you may think to do this when you need write some code for an Expression. Beware, though they look deceptively similar, the full Gaffer API is not available in expressions, and references to plugs behave quite differently.

This sometimes leads to an attempt to call something like parent["Sphere"]["radius"].getValue() in an expression, and an exception like the following :

ERROR   [Execution error] Expression1.__execute :"python/Gaffer/PythonExpressionEngine.py", line 88, in execute
line 1, in <module> AttributeError: 'float' object has no attribute 'getValue'
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Configuring the Scene View Inspector

Gaffer 0.58 introduced a new Inspector in the Scene View. It allows you to quickly view – and in many cases – edit the selected location’s shader parameters.

We attempted to select a sensible set of parameters to display by default, but in keeping with Gaffer tradition, you can configure what is shown to suit your needs.

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Gaffer 0.58.0 : We’re going on a bug hunt

Gaffer 0.58 contains a caching optimisation that can significantly improve interactive performance in many cases. But this optimisation can also reveal subtle bugs in Nodes that may have gone unnoticed until now. In this post we’ll explore why that is the case, and outline some useful strategies for catching and eradicating such bugs from your custom nodes.

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