meshes_surface_merge.cpp

Generate the figure that consists of multiple spheres merged into the single surface object without booleans

// Generate the figure that consists of multiple spheres merged into the single surface object without booleans
#include <CoreAPI.h>
//@config: Debug
// this is the class with parameters. It is used in UI and for the generating as well. Look the dialogs example.
class SpheresGenerator:public BaseClass {
public:
    SpheresGenerator() {
        numSpheres = 200;
        FigureRadius = 30;
        FigureRadiusVariation = 0.1;
        SpheresRadius = 10;
        SpheresRadiusVariation = 0.5;
    }
    int numSpheres;
    float FigureRadius;
    float FigureRadiusVariation;
    float SpheresRadius;
    float SpheresRadiusVariation;
 
    // this is class registration, look dialogs example
    SERIALIZE() {
        SLIDER(numSpheres, "numSpheres", 1, 1000);
        FSLIDER(FigureRadius, "FigureRadius", 1, 100, 1, false);
        FSLIDER(FigureRadiusVariation, "FigureRadiusVariation", 0, 1, 100, false);
        FSLIDER(SpheresRadius, "SpheresRadius", 1, 100, 1, false);
        FSLIDER(SpheresRadiusVariation, "SpheresRadiusVariation", 0, 1, 100, false);
    }
    // generate random value with variation
    float random(float value, float variation) {
        return value * (1.0f + variation * rand() / 32768.0f);
    }
    // generate the random surface spheres
    void generate() {
        // load the sphere mesh
        coat::Mesh m;
        m.Read("data/Samples/Sphere.obj");
        // add new volume
        auto current = coat::Scene::sculptRoot().addChild("Random spheres:" + coat::str::ToString(numSpheres));
        auto volume = current.Volume();
        // turn to voxels
        volume.toSurface();
        coat::Mesh summ;
        // collect all meshes into the single mesh
        for (int i = 0; i < numSpheres; i++) {
            // create transformation matrix.
            // scaling to the sphere radius
            coat::mat4 transform = coat::mat4::Scaling(random(SpheresRadius, SpheresRadiusVariation));
            // translate using the random vector
            transform *= coat::mat4::Translation(coat::vec3::RandNormal() * random(FigureRadius, FigureRadiusVariation));
            // transform and add the mesh to the summary mesh
            summ.addTransformed(m, transform);
        }
        // merge the summary mesh into the scene
        volume.mergeMesh(summ, coat::mat4::Identity, coat::BOOL_MERGE);
    }
};
 
EXPORT
int main() {
    // get to sculpt room
    coat::ui::toRoom("Sculpt");
    // create the generator object
    SpheresGenerator sg;
    coat::dialog dlg;
    // load generator settings if exist
    sg.ReadFromFile("data/Temp/Spheres.json");
    if(dlg.ok().cancel().params(&sg).show() == 1) {// ok pressed, buttons start from 1
        // save settings
        sg.WriteToFile("data/Temp/Spheres.json");
        // generate the figure
        sg.generate();
    };
    return 0;
}