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Sabine62

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Sphere-Inversion

« on: June 05, 2020, 10:52:12 AM »

I always have to search for this... 

Code: [Select]

Sphere-inversion

#group SphereInversion
uniform vec3 InvCenter; slider[(-180,-180,-180),(0,0,0),(180,180,180)]
uniform float InvRadius; slider[0.01,0.1,100]
uniform vec3 ReCenter; slider[(-5,-5,-5),(0,0,0),(5,5,5)]
uniform bool SphereInversion; checkbox[false]


float DE(vec3 p){
if(SphereInversion){
p=p-InvCenter-ReCenter;
float r=length(p);
float r2=r*r;
                float InvRadius2=InvRadius * InvRadius;
p=(InvRadius2/r2)*p+InvCenter;
float de=DE1(p);
de=r2*de/(InvRadius2+r*de);
return de;
}
else return DE1(p);
}

Linkback: https://fractalforums.org/code-snippets-fragments/74/sphere-inversion/3556/

« Last Edit: June 05, 2020, 03:14:10 PM by Sabine62 »

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mclarekin

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Re: Sphere-Inversion

« Reply #1 on: June 05, 2020, 02:46:54 PM »

you can use  invertRadius2  slider  and save some multipication

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Sabine62

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Re: Sphere-Inversion

« Reply #2 on: June 05, 2020, 03:10:01 PM »

Quote from: mclarekin on June 05, 2020, 02:46:54 PM

you can use  invertRadius2  slider  and save some multipication

Optimization... one of my many weak points  

Thanks a lot, mclarekin, will change right away! 

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