How do I...?
You can save any scene from the Render module as an image by wiring a button to Render's Snap port. Pressing the button causes the scene to be output from Render's Snapshot port. You can then view it using the DisplayImg module, or save it to a file using the WriteImg module.
Run ViewDemo with the snap.skm script file to see how it works.
You can save any sequence of scenes from the Render module as an animation by wiring a slider to Render's Snap On Redraw port. Setting the slider to a non-zero value causes the scene to be output from Render's Snapshot port whenever it is changed. You can then save it to a file using the WriteMPG module.
Run ViewDemo with the redraw.skm script file to see how it works.
You can save any part of the 3D scene displayed in the Render module to a file. To save all the geometry, use the Pick All option on Render's Edit menu. The geometry is output on Render's Picked Geometry port, where it can be saved to file using the WriteGeom module. Alternatively, individual parts of the scene can be saved by picking on them, or WriteGeom can be wired directly to the geometry module itself.
Run ViewDemo with the savescene.skm script file to see how it works.
The camera defines the view of the 3D scene displayed by the Render module. You can save it to a file by wiring the WriteGeom module to Render's Output Camera port. It can be restored using a ReadGeom module wired to Render's Input Camera port.
Run ViewDemo with the savecam.skm script file to see how it works.
Visualizations can be enhanced by adding text, captions, titles or legends. These are passed into Render's Screen port, from which they are displayed in two-dimensional screen space, independent of the orientation of the camera.
Run ViewDemo with the screen.skm script file to illustrate this using the Legend module.
You can create a loop in an IRIS Explorer map which causes any parameter value to change from a starting value to an end value by a series of steps. This can be useful when creating an animation, or when trying out a range of parameter values. It is done using the For module.
Run ViewDemo with the forloop.skm script file to see how it works.
Sometimes it's necessary to reduce the amount of data which is to be visualized, either for reasons of performance or simplicity. In particular, you might want to only view every - say - fifth data value, or be only interested in a certain part of the data domain. This can be done using the SampleCrop module.
Run ViewDemo with the sampling.skm script file to see how it works.
A variety of image processing techniques can be used to enhance or improve the contents of a two-dimensional image. These include edge-detection, blurring, Fourier transforms and color enhancement.
Run ViewDemo with the imaging.skm script file to illustrate the use of some of them.
A two-dimensional array of topographic heights provides an example of a dataset where one variable (the height) is a function of two others (latitude and longitude). Other examples could include the temperature of a two-dimensional surface, or a mathematical function of two variables, f(x,y). In general, the two variables x and y are referred to as independent variables, while the third variable (f) is called the dependent variable. There are two classes of techniques in IRIS Explorer which can be used to display this type of data data:
Some examples of a three-dimensional dataset include temperature in a room, atmospheric pressure in a three-dimensional chamber, or a mathematical function of three variables, f(x,y,z). In general, the three variables x, y and z are referred to as independent variables, while the third variable (f) is called the dependent variable. This type of dataset can be displayed by calculating an isosurface, which is a surface in three-dimensional space which passes through all points where the dependent variable has a given value (called the threshold value).
Run ViewDemo with the simple.skm script file to illustrate the calculation of an isosurface using the IsosurfaceLat module.
Datasets which have a magnitude and direction at each coordinate are referred to as vector-based. Some examples are flow fields, velocity fields forces and other gradient data. There are two classes of techniques in IRIS Explorer which can be used to display vector-based data:
© The Numerical Algorithms Group Ltd, Oxford UK. 2001