ArcScene crashes every time I try to export a TIN to .wrl also, and I would love to know how to get around this problem.
I was able to export a simple raster file from ArcScene to .wrl, but even that took forever and crashed a few times before it worked. Also, even with the slider for jpg image quality all the way up, the jpg file for texture is very low resolution, not really good enough for what I want to do.