Screw thread - first attempt

[Ian Mercer]

Wondering if anyone else has attempted to create screw threads using ICESL implicit functions. Here's my first attempt using an implicit_distance_field:

-- conical screw thread

r = 20.5

height = 40

shape = implicit_distance_field( v(-r,-r,0), v(r,r,height),

[[

uniform float base_radius = 12;

uniform float top_radius = 10;

uniform float height = 15;

uniform float th = 0.9;

float distance(vec3 p) 

{

    // thread size ratio

    float fh = p.z / th;

    // conical shape

    float r = base_radius + (top_radius-base_radius) * (p.z/height);

    // fade in the screw thread

    float tr = min(2,

      min(0.2*p.z*p.z, 

        0.2*(height-p.z)*(height-p.z)));

    float cn = sqrt((p.x*p.x)+(p.y*p.y)) - r;

    float drill_hole = 4 - sqrt((p.x*p.x)+(p.y*p.y));

return max(drill_hole, min(cn, sqrt(

     (p.x+tr*cos(fh))*(p.x+tr*cos(fh)) + 

     (p.y+tr*sin(fh))*(p.y+tr*sin(fh))

     ) / (2*r) - 0.51));

}

]])

set_uniform_scalar(shape, 'base_radius', 12.4)

set_uniform_scalar(shape, 'top_radius', 9.2)

set_uniform_scalar(shape, 'height', height)

set_uniform_scalar(shape, 'th', 0.9)

emit(shape, 5)

[Re-try WhenDown]

I see you found the uniform variables yourself, so disregard my last message.

This one looks good! If you wanna contribute this as an example packaged with IceSL, please do a PR it to the following repo:

https://github.com/shapeforge/icesl-models

Le 7 déc. 2020 à 08:23, Ian Mercer <i...@mercerfamily.org> a écrit :

Wondering if anyone else has attempted to create screw threads using ICESL implicit functions. Here's my first attempt using an implicit_distance_field:

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[MEHULKUMAR DHOLA]

I am making parametric spiral bevel gear do you want to work on that project