Plotting and interacting with variables


We'll try plotting variables next.
Goto Plots->Pseudocolor. You will see a number of variables which can be plotted.
Select "ta".
Click Draw. A pseudocolor plot with a matching legend and min/max information shows up. Note that most of the plot is blue since the max value (undefined) is set to be 1e36 so most of the color spectrum is wasted.

Double click on Pseudocolor plot. This will bring up a sub-menu with plot properties.
Insert 300 for the Max field. This will map the color range to the (ta min, 300) range.You might need to hit "Apply" and "Draw" for the changes to take effect.

You can try changing a number of properties of the Pseudocolor plot. Click on "Color Table" and change to "hot_and_cold". You can choose any color scheme and even create your own. Try experimenting with changing the Opacity and Changing the Centering to Nodal/Zonal. You can now hide this plot.

Another way to look inside a solid 3D mesh is to use a Clip operator.
Create a pseudolocor plot for "ta".
Choose Operators->Clip.
Double click on Clip operator properties. You can enable all 3 clip planes to remove an octant.

VisIt can easily handle time varying data.
Load the csu-2d.nc dataset.
Make a Pseudocolor plot of "tas" variable.
Underneath the Selected Files bar, you will note movie-player like controls for cycling through timesteps. In fact the selected files menu shows that there are 3 cycles available.
Hit the play button or manually move the time slider. The pseudocolor plot should update automatically.

You can overlay multiple plots on top of each other.
Goto Plots->Contour.
Make a contour plot of "tas".
Double click on Contour plot properties and change the color scheme to gray. You can change the number of contour lines; styles; ranges; opacities and so on.