Boundary conditions (loads and restraints) are applied to surfaces and meshes that correspond to boundaries of the solids on which simulation is being carried out. Grasshopper will allow b-reps to be decomposed into their constituent faces to which boundary conditions can be applied, and there may be situations where this is desirable for automation. However, for manual application of boundary conditions to existing solids, Rhino's ExtractSrf command with Copy set to “Yes” is a straightforward mechanism to specify faces interactively.

Standard Rhino data types (e.g. b-reps, surfaces, curves, vectors, points, numbers, etc.) may be added to inputs of Grasshopper blocks by right-clicking on the label of a block's input. This can help avoid cluttering the canvas with grasshopper components for all of the inputs.

During visualization, Grasshopper's rendering of geometry can interfere with the clear display of the solution quantities. Select the blocks whose geometry preview is interfering with the visualization. Then use the middle mouse button to bring up Grasshopper's radial menu. Select Disable Preview to turn off these blocks.