B E Z I T O P O

Bezitopo now has a GUI. It's called ViewTIN, as all it shows is points, a TIN, and contours, but I'll eventually rename it, once it has more functionality.

New files

Bezitopo has two new file formats: criteria files, which tell which points to include in a topo, and type-0 breakline files, which are just the breaklines you're used to. (Type-1 breaklines will tell where one point's slope doesn't affect a neighboring point's. They're meaningless with flat triangles.)

This is a criteria file:

It is a CSV file. The first two columns are point numbers, the next two are elevations, the next is a substring of the point description, and the last is 1 to include in the topo or 0 to exclude. The elevations are in the current unit.

This is a breakline file:

Usage

The Bezitopo source directory includes these files:

To generate contours of Independence Park:

1. Set the units to US survey feet.
2. Import the PNEZD file topo0.asc. (This is called importing, because loading will be done to .bez files. Bezitopo can't yet read a .bez file.)
3. Import the criteria file topo0.crit.
4. Import the breakline file topo0.brk.
5. Make the TIN.
6. Select a contour interval. You can select an interval in meters or in feet.
7. Draw smooth contours.

To edit breaklines:

• Click or double-click on an edge of the TIN.
• When the cursor is on an edge, it displays two numbers, like "1184-1157", next to the cursor. If it shows three numbers in parentheses, it's inside a triangle, and if it shows just one number and a point description, it's on a point. In either of these cases, clicking on it has no effect.
• Single-clicking on an edge toggles its "in breakline" bit. Double-clicking on an edge flips it, if possible.
• If an edge is thick blue, it's in a breakline. If it's also dashed, it's a necessary breakline; leaving that edge out of the breaklines would result in a different edge in the TIN.
• ViewTIN will not ask you if you want to save the breaklines when you exit. It just exits.

When experimenting with different breaklines, you will generally want to draw rough contours, because it's faster than drawing smooth contours.

The other files, flattri.asc, notri.asc, and samepnts.asc, are for triggering errors in TIN generation.

Screenshots

Finally some screenshots of Bezitopo itself!

Part of Independence Park, showing a sloping road, without breaklines

Part of Independence Park, showing a sloping road, with breaklines

The rectangular drain covers 1258 etc., without breaklines

The rectangular drain covers 1258 etc., with breaklines

Download

• Tarball
• Signature

System requirements

Requires CMake 3.1.0 or later, Qt 5.x, and a C++ compiler that understands string::pop_back.

DragonFly BSD: It works on 5.0.0.

Debian and derivatives: Jessie or later. See /etc/debian_version . Ubuntu Xenial's Debian version is Stretch.

Release build status

• Ubuntu Xenial and Artistic x86_64: It builds and works well.
• DragonFly BSD 5.0.0 x86_64: It builds and works well.
• Raspbian Jessie: It builds and works well.
• Cygwin: It builds and works, but outputs messages about a window, and Cygwin has been known to crash while it's running.