Blendsurf is a C++ library to represent surfaces of arbitrary smoothness (C^\infty and C^k) written by Lexing Ying and Elif Tosun. Minor additions added by Matt Morse. Currently NOT maintained. It is made available for use as is in other projects.

Requires:

• OpenMP
• BLAS/LAPACK
• CMake 3.1

The renderer requires:

• OpenGL version that supports EXT_texture_cube_map

Library compilation tested on OSX 10.10 and Cent OS 7.3 with gcc-4.8 and icc/icpc 17.0.1. The renderer has been tested with gcc-4.8 on OSX 10.10.

To compile the library:

mkdir build
cd build
CC=<your-c-compiler> CXX=<your-cxx-compiler> cmake ..
make 

To compile the renderer, use

CC=<your-c-compiler> CXX=<your-cxx-compiler> cmake -DCOMPILE_RENDERER=True ..

Legacy rendering code is available in vis/. This is not maintained. It compiles and runs as expected with the current CMakeLists.txt's, but it requires EXT_texture_cube_map in your linked OpenGL implementation. This is deprecated and current versions of OpenGL do not support it. Moreover, the options file vis/visoptions3d requires -bdsurf_submatlibfile and -bdsurf_bdulibfile to point to the location of ccsubmatall.dat and bdsurf_U_ONE.dat respectively, which are downloaded from the link below. Legacy makefiles are included for future reference.

On the off chance someone gets the viewer running again: The options file for the visualization code is visoption3d, with some comments explaining each value. In the legacy viewer, the following keys are active:

• P = display/remove control mesh
• R = render surface
• S = surface control, switches between different views reflection map, checkerboard map, higher order derivatives
• V = switch from one vertex to another for surface control
• F = wireframe
• I = influence boundary
• C = center
• home = return to original view
• W = write ppm file
• Q = exit

Legacy test cases, precomputed data required for some options, and scripts are available at https://drive.google.com/open?id=13Gpjq5fFwwzCQ4XnaRQQOliNbOwTLaNP, but I'm not exactly sure what most of the files are for.