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Quaternion Julia Raytracer HD Lite

Quaternion Julia Raytracer HD Lite

 

Description

This is the lite version of the Quaternion Julia Raytracer HD App. The full app adds features such as high quality rendering, full screen rendering, color contols and shadows.

Just like the traditional Julia fractal, a quaternion Julia fractal is computed as stable complex points of an iterative funtion in the complex space. However, in contrast to 2D julia fractals, 4-dimensional complex numbers, so called quaternions, are used instead of 2-dimensional complex numbers.

This App uses the GPU of the iPad to compute a 3D slice through the 4D complex space of the quaternion Julia set by raytracing with OpenGL ES 2.0 shaders.

Instructions:

A one finger drag rotates the camera around the object, a two finger pinch zooms and a three finger drag translates the camera.

Double/Triple tap and drag the finger horizontally or vertically to change the shape of the quaternion Julia fractal. You can also set these constant in the Settings tab. The Settings tab also allows to enable an environment that is mirrored on the Julia set. The accuracy of the fractal surface can also be set here.

!!!! Important announcement !!!!

To take a screen shot, hold down the home button and then push the top button. The screen will flash and the resulting image will be placed on your camera roll. From there, you can sync it back to your computer, e-mail it to friends, or do anything else you can do with any other photo in your camera roll.

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Rated 3/5 based on 3 customer reviews.

 

4/5 stars

Really great way of showing off the touch interface

:
A really great way of showing off the touch interface on the iPad. Really nice to just sit down and relax, put on some music and play with making some eye candy. Tip: don't forget you can take a screenshot at any time on your iPad by pressing the home button and the sleep button at the same time (don't hold them)

2/5 stars

Way too slow

:
...otherwise it would be cool

5/5 stars

This is not slow at all, it is actually quite fast as raytracing goes.

:
Whoever gave the comment that it is to slow has been spoiled with fake reflection mapping on Nvidia cards withpixel shaders. This is a low energy CPU let us not forget, for what resources are available to it is amazingly fast. BTW, I personally won a animation Ward from Alias/Wavefront in 1996, and had been using raytracing packages since Sculpt 3D on the Amiga platform, I also have been to three SIGGRAPH conferences, and know Ton Roosendal, as he does me, who created the open source 3D animation package blender, and for what THIS application does it is a fun way to explore a procedural surface. I personally hope blender comes to the iPad platform in some form or another, but until then this application presents a shining example of the kind of interactivity one can have with a realtime rendered 3D object on the iPad platform, coupled with a intensely detailed rendering of the selected perspective. Sure it is a cheap low resolution rendering of the scene blown fullscreen in interactive mode, but it works and is interactive, and gives you just enough information to be useful. The alternative would be to provide a low resolution geometry, but the surface detail would not be convincing and it would be entirely too slow, it is so much better to have an interactive rendering, especially since the subject material is not stored data but a procedural algorithm, that can more easily be traced directly than to be tesselated to a polygonal model.

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The information may be outdated (2017-03-06 17:16:54). For actual information go to iTunes

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