Implicit Surface Modeling for 3D Printing
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This document summarizes a presentation given on implicit surface modeling for 3D printing using signed distance fields and raymarching. The presentation discusses how signed distance fields can implicitly define 3D volumes and shapes using mathematical functions. It also explains how raymarching can be used to render these implicit surfaces in real-time and how marching cubes can extract triangle meshes from the signed distance fields to output 3D models that can be 3D printed. Benefits of this approach for 3D printing discussed include producing unbreakable surfaces, perfect volume definitions, and enabling cheap deformations, blending, shelling, soft shadows and reflections for generated models. The presentation concludes with a live demo of dynamically modifying a signed distance field to tweak a
![DEMO SDF:
float frequency = 10.0; // input1: [5.0, 15.0]
float speed = 0.3; // input2: [0.1, 30.0]
float smoothness = 0.6; // input3: [0.1, 1.0]
float wall = 0.15; // input3: [0.15, 0.3]
vec3 p = point;
float box = sdBox(p, vec3(2.0, 0.2, 0.2));
p.x += sin(p.y*4.+time+sin(p.z))*0.15;
float d = length(p)-1.;
float st = sin(time*0.42)*.5+0.5;
d += sin(p.x*frequency + time * speed + sin(p.z*frequency+time*.5+sin(p.y*frequency+time*.
7)))*0.075*st;
d = opUSmooth(d, box, smoothness); // change to opSSmooth
//if (d < - wall * 0.5) d = - wall - d;
//d = opS(d, sdBox(opMoveX(11.0 + sin(time) * 1.5, point), vec3(10.0, 10.0, 10.0)));
distance = d;](https://image.slidesharecdn.com/implicitsurfacemodelingfor3dprinting-150704112206-lva1-app6891/85/Implicit-Surface-Modeling-for-3D-Printing-34-320.jpg)
Implicit Surface Modeling for 3D Printing
- 1. Implicit Surface Modeling for 3D Printing WebGL Meetup Berlin @ xy:matic office on 2015/07/02 by Mike Schäkermann (Stilnest.com, Head of IT)
- 2. Stilnest
- 3. 3D Printing Sucks at ... Excels at ...
- 4. 3D Printing Sucks at mass production of generic products Excels at ...
- 5. 3D Printing Sucks at mass production of generic products Excels at on-demand production of anything
- 6. 3D Printing Sucks at mass production of generic products Excels at on-demand production of anything MASS CUSTOMIZATION
- 7. We need ... the software to support this dream A WEBLINK TO CLICK
- 8. We need ... the software to support this dream A WEBLINK TO CLICK SIMPLE INTERFACES
- 9. We need ... the software to support this dream A WEBLINK TO CLICK SIMPLE INTERFACES REAL-TIME FEEDBACK
- 10. We need ... the software to support this dream A WEBLINK TO CLICK SIMPLE INTERFACES REAL-TIME FEEDBACK UNBREAKABLE MODELS
- 11. Let me introduce... Raymarching of Signed Distance Fields
- 12. What is a Signed Distance Field (SDF)? A function, implicitly describing a volume: - input: 3D position of a point in space - output: the distance of this point from the surface of the volume (zero if point is on the surface, negative if it is inside and positive if it is outside the volume) float distanceToSurface(vec3 position) { … }
- 13. SDF: an easy example Who can tell me what shape is defined by the following SDF? float distanceToSurface(vec3 position, float r) { float distance = length(p) - r; return distance; }
- 14. Content creator: Iñigo Quilez
- 15. Content creator: Iñigo Quilez
- 16. Content creator: Iñigo Quilez
- 17. Content creator: Iñigo Quilez
- 18. RAYMARCHING OF SDFs THE GENERAL IDEA Content creator: 9bit Science
- 19. Content creator: Miles Macklin
- 20. Content creator: Iñigo Quilez
- 21. Content creator: Iñigo Quilez
- 22. Nice, but how do we get a file for a 3D printer out of all this???
- 23. Marching Cubes … or any other algorithm for triangulating iso-surfaces Content creator: Tim Poston et. al.
- 24. Marching Cubes Parallelization of distance sampling on GPU is trivial! Content creator: Tim Poston et. al.
- 25. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Unbreakable surfaces
- 26. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Perfect volume definitions
- 27. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Cheap deformations
- 28. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Cheap blending
- 29. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Cheap shelling
- 30. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Cheap soft shadows
- 31. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Cheap reflections
- 32. Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because: Real-time tweaking of params
- 34. DEMO SDF: float frequency = 10.0; // input1: [5.0, 15.0] float speed = 0.3; // input2: [0.1, 30.0] float smoothness = 0.6; // input3: [0.1, 1.0] float wall = 0.15; // input3: [0.15, 0.3] vec3 p = point; float box = sdBox(p, vec3(2.0, 0.2, 0.2)); p.x += sin(p.y*4.+time+sin(p.z))*0.15; float d = length(p)-1.; float st = sin(time*0.42)*.5+0.5; d += sin(p.x*frequency + time * speed + sin(p.z*frequency+time*.5+sin(p.y*frequency+time*. 7)))*0.075*st; d = opUSmooth(d, box, smoothness); // change to opSSmooth //if (d < - wall * 0.5) d = - wall - d; //d = opS(d, sdBox(opMoveX(11.0 + sin(time) * 1.5, point), vec3(10.0, 10.0, 10.0))); distance = d;