muyyatin
Joined 16 years ago
Karma
284
Submissions
80
Member since
Aug 10
Recent submissions
Comment · 8 years ago
If it's in orbit, yes. I thought the discussion was based on something sitting on the surface of the Earth.
Comment · 8 years ago
But, ignoring things like air resistance, the lower the thrust is, the more delta-V/energy it takes to escape?
For instance, if you had a rocket with a fixed delta-V and it used all of its energy almost instantaneously, say it escapes from Earth. But if you lower its thrust so that it is not accelerating upward (lower than the force of gravity), it could use the same delta-V without leaving the ground.
Comment · 12 years ago
I've been tracking a number of differences between how browsers render Canvas content: http://jonathan-olson.com/notes/canvas-browser-specific-quir..., and take advantage of it to use the same code to generate a different picture in every browser (http://jonathan-olson.com/experiments/browser-specific-conte...)
I'll probably need to add this one to the list!
Comment · 12 years ago
It's somewhat similar to a Flash-only website, since it has less support and most notably lacks many of the features HTML makes easy (search engine indexing, browser search-and-find, ease of development, layout, and separation of content from style).
Comment · 12 years ago
Sorry about that! I had someone else report that it fails across all browsers with the HD4400.
Comment · 12 years ago
Sorry about that! Do you mind if I ask what browser and/or graphics card caused this?
Comment · 12 years ago
I just checked http://www.browserleaks.com/webgl on Win 7, and Firefox 30's ANGLE uses Direct3D 9, whereas Chrome's Canary (v38, best performance) uses Angle with Direct3D 11.
Firefox might upgrade this sometime, but Aurora (Firefox 32) still uses Direct3D 9.
Comment · 12 years ago
I've done some similar implementations years ago (but with C/OCaml, nothing on the GPU), so I didn't refer to many things for this.
Fresnel reflectance is based off of http://mathinfo.univ-reims.fr/IMG/pdf/Combined_rendering_of_..., although I'm not doing any spectral or polarization-dependent code right now (I wanted to leave that open, and it allows accurate metal simulation).
I tinkered with a blend of some pseudorandomness functions until getting something that worked.
https://www.siggraph.org/education/materials/HyperGraph/rayt... was used for ray-box intersection.
The distance function experiment for the drinking glass is based off of the concept of http://www.iquilezles.org/www/articles/distfunctions/distfun... (like raymarching, includes normal computation).
I consulted http://madebyevan.com/webgl-path-tracing/ to see the best way to do accumulation (and made some realism fixes in https://github.com/jonathanolson/webgl-path-tracing, see https://github.com/evanw/webgl-path-tracing/pull/1 for details).
Many other things can be pulled from online or from books like http://www.amazon.com/Game-Engine-Design-Interactive-Technol....
Please let me know if you have any questions, (see my email at http://jonathan-olson.com/about), and please feel free to use my code however you like (things I wrote are MIT, but I use CC-by and CC-by-non-commercial HDR images).
Comment · 12 years ago
Thanks!
Comment · 12 years ago
Author here! It's very true that the GPU does the heavy lifting, although I'm not sure exactly where an "in the browser" line could be drawn (conceptually any page uses the browser as an execution engine and library).
It's a bit trickier due to restrictions in WebGL (OpenGL ES based) compared to the desktop (e.g. no bitwise operators makes it a pain to get randomness that doesn't bias the result), but it's basically the same.
Comment · 12 years ago
Seems like it might make people more likely to run into camouflaged obstacles (particularly those vision-impaired). Imagine running through a park at night with camouflaged electrical boxes.
I heavily agree with painting artwork on them. A few blocks away, there is a painted electrical box that I have become quite attached to.
Comment · 12 years ago
Taking test-driven development too literally?
Comment · 13 years ago
I haven't seen it mentioned, but working for a university project funded by public and/or private grants (in my case for free educational software) is working quite well.