CashFlow, A Visualization Framework for 3D Flow - Studierstube ...

Software Design3.12. User Interaction3.12 User InteractionWhen using the scene graph library a wide variety of input and output devices is offeredto the user. Subject to the data source in general the user can alter the attributes ofthe data generation or data simulation. When using a CFD – systems 7 the change ofparameters is a highly non–trivial task. Thus a user friendly interface is essential forquick results. In terms of the visualization pipeline the user can change the raw data. Ifthis should be not possible he can still adjust the parameters used inside the CashFlowframework, which are the attributes for the Filter, Mapper and Render nodes.Figure 3.15: CashFlow: Boxes and grey arrows show process flow. Round boxes and tailed arrows indicateuser interaction (UI) process. (compare to fig 3.1)The process flow of external data generation in combination with CashFlow isshown in figure 3.15. In this figure the blue boxes show components of CashFlowwhile the green rounded boxes in the lower part of the figure indicate components alteredby the user while interacting. The Loader node imports the raw data into theCashFlow framework. The data may be processed now by a Mapper node before itis converted into the final image by Render node’s. Now the user can either alter theattributes for CashFlow to generate a new image or the user may even be able to changethe attributes of the data generation producing new raw data.Note, that this process flow is an extension to figure 3.1 on page 38, where the blueboxes were used only.7 CFD...computational fluid dynamics, numerical simulation of fluids64