This program is a 3D function plotter, written completely in Ti-Basic.
As expected, the framerate was very slow, 0.1 fps on average.
To solve that problem the program buffers 10 frames in the Pic vars,
this takes about 1min50. During this buffering the drawing is shown so you can already see what the graph looks like.
After the buffering you can turn the graph left and right using the arrow keys. This works very well and fast, it gives you a clear image of the 3D graph, like in the gif animation.

---USAGE---:
New graph: Enter an equation and watch the plot beeing calculated, this takes about 1min 50sec. If you didn't change any settings it will set the camera angle to 45° and it will plot with zoomfactor 1. See below if you don't know what these settings mean.

View graph: View the last calculated graph. Use your arrow keys to rotate left and right. Your graph will be remembered, even if you quit the program or turn of the calculator, this way you don't need to wait to see the same graph again.

Recalculate: If you want new settings to apply to your current graph, you have to recalculate. It will use the last entered equation.

Settings: Here you can choose the camera angle and zoom factor, you need to recalculate for these settings to apply to your current graph, so it's best to change settings before you use "New graph".

Camera angle: This is the height of your camera as an angle, 0° means front view, 90° is top view. I use 45° most of the time. Be sure to use the degree symbol is your calculator is set to radians.

Zoom factor: Your graph will be scaled to this factor. If not set, or set to 1, your function will be plotted from x,y=-4 to x,y=4; if set to 0.5 for example, it wil zoom out, and plot from x,y=-8 to x,y=8.