Implicit Surface Modeling for 3D Printing

WebGL Meetup Berlin@ xy:matic office

on 2015/07/02by Mike Schäkermann

(Stilnest.com, Head of IT)

Stilnest

3D Printing

Sucks at ...Excels at ...

3D Printing

Sucks at mass production of generic productsExcels at ...

3D Printing

Sucks at mass production of generic productsExcels at on-demand production of anything

3D Printing

Sucks at mass production of generic productsExcels at on-demand production of anything

MASS CUSTOMIZATION

We need ...the software to support this dream

A WEBLINK TO CLICK

We need ...the software to support this dream

A WEBLINK TO CLICK

SIMPLE INTERFACES

We need ...the software to support this dream

A WEBLINK TO CLICK

SIMPLE INTERFACES

REAL-TIME FEEDBACK

We need ...the software to support this dream

A WEBLINK TO CLICK

SIMPLE INTERFACES

REAL-TIME FEEDBACK

UNBREAKABLE MODELS

Let me introduce...

Raymarching of Signed Distance Fields

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) { … }

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;

}

Content creator: Iñigo Quilez

Content creator: Iñigo Quilez

Content creator: Iñigo Quilez

Content creator: Iñigo Quilez

RAYMARCHING OF SDFsTHE GENERAL IDEA

Content creator: 9bit Science

Content creator: Miles Macklin

Content creator: Iñigo Quilez

Content creator: Iñigo Quilez

Nice, but how do we get a filefor a 3D printer out of all this???

Marching Cubes

… or any otheralgorithm fortriangulatingiso-surfaces

Content creator:Tim Poston et. al.

Marching Cubes

Parallelization of distance samplingon GPU is trivial!

Content creator:Tim Poston et. al.

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Unbreakable surfaces

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Perfect volume definitions

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Cheap deformations

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Cheap blending

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Cheap shelling

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Cheap soft shadows

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Cheap reflections

Recap: SDF Raymarching + Marching Cubes is cool for 3D Printing because:

Real-time tweaking of params

http://primary-matter.meteor.com/

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;