daily commit
add keyboard control for model renderer angle
reuse heightmap and normal map in each run
Use cv::threshold to filter input image, remove roi mat
use guassian kernel to pyramid upscale and downscale heightmap
update normal to height code to better reuse existing matrix
scale heightmap before display
optimized heightmap solver
update convergence threshold in Gauss-Seidel algorithm, threshold now changes with pyramid level
video version without solving webcam latency