Drawingelement is a base class for an item in the model that can be displayed. These items include edges, construction points, construction lines, and images. Arc curves and arcs are not included because they are not drawing elements by themselves, but are a composition of edges.
For a Edge, ComponentInstance and most other Sketchup::Drawingelements, the boundingbox follows the coordinate system the drawing element is placed in. For ComponentDefinition, the box bounds the contents of the component and follows the component's own internal coordinate system.
Render Elements are a way to break out renders into their component parts such as diffuse color, reflections, shadows, mattes, etc. This gives fine tune control in the final image using compositing or image editing applications when re-assembling the final image from its component elements. Render elements are also sometimes known as render passes.
Render Elements are generated at render time based on the ones you choose before rendering. Most render elements have parameters that can be set to customize the render element or its later use in compositing software. These parameters are described on each render element's individual page, along with common uses and any notes on their generation and usage.
The creation of render elements is available from two places in the Asset Editor: from the Create Asset button and the Render Elements category icon (top). If the Render Elements category is empty, left- or right-clicking the icon prompts you to create a new asset. Otherwise, it selects the category in which case right-click opens the creation menu.
FWIW - Both Adobe Illustrator and Affinity Designer will recognise single element fractional entries - it parses these as a maths string, so if you enter for example 2/5 into the Width unit in the Transform palette, (and your Document Setup has identified Inches as your unit) it will transform that dimension in your geometry to the correct 0.4" size - but it cannot for example parse 1 1/2 - hence my single element constraint. The maths parser means that you can, for example, enter 0.4*3 and the transform will give you a length of 1.2".
Figure it out! Each optical element has an efficiency that is dependent on wavelength, and will affect your usable signal. Also, think carefully during the design process about the need to align optics as the device is built. Pay close attention to all tech specs to make sure all of your optics will perform as needed. It will be up to your team to review the return policy of any store you order from.
In response to questions from the audience, Foster stated that rubrics can be developed to cover both qualitative and quantitative elements. Developing good rubrics is an iterative process; it took her some time to sharpen her skills. There is flexibility in differentiating points allotted, but the instructor must be thoughtful, plan for a desired outcome, and communicate clearly. The rubric tool can be used to grade PDF files as well as Word documents. Foster noted that it is important to take opportunities to teach students to learn to write, learn to use technology, learn to read instructions, and learn to look at feedback given on assignments. Being transparent and explaining why you are using a particular technology will go a long way.