3D Ray Marching (simple shapes)

Description

Raymarching references: https://youtu.be/Cp5WWtMoeKg (explanation) https://youtu.be/PGtv-dBi2wE (tutorials) https://youtu.be/Ff0jJyyiVyw (shapes) Unrealistic penumbra-shadowing reference: https://www.iquilezles.org/www/articles/rmshadows/rmshadows.htm SDF functions of shapes reference: https://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm Reflected ray calculation reference: http://paulbourke.net/geometry/reflected/ The rest was built from scratch for Scratch. 7-Mar-2020: Applied new rendering features from Kouzerumatsu's remix (bugfix, fresnel reflectance, out-of-focus diffusion, hq) and added new shapes: octahedron and sphere arc. ray marching marcher tracer tracing 3d math

Instructions

Hit the green flag or [space] to show parameters. Press [space] key or green flag again or tap on the middle of the screen to start rendering. This is computationally expensive, and run it with turbo mode. See Inside > Edit tab > Turn turbo mode on or just [hold shift] + [green flag click] Render time of full-resolution by multiplying render time of resolution divisor 16 by 256, approximation. It took 40 seconds for me, which means it would take ~10240 seconds to render it with full resolution. Run it with forkphorus, if you have no patience: https://forkphorus.github.io/#372144443