hemesh-controlp5 question

Contributed Library Questions

morrow.li..

in Contributed Library Questions • 2 years ago

how do I link the hemesh box chamfer to the control p5 slider. It doesn't update with the rest of the script.

import controlP5.*;
import wblut.hemesh.modifiers.*;
import wblut.hemesh.tools.*;
import wblut.hemesh.wip.*;
import wblut.hemesh.subdividors.*;
import wblut.hemesh.*;
import wblut.hemesh.creators.*;
import wblut.geom.*;
import wblut.math.*;
import wblut.hemesh.kdtree.*;
import guicomponents.*;
import processing.opengl.*;
//declare
GVertSlider sdrScale;
float zoom;
float zoomfactor;
Particle p[];
int num;
HE_Mesh mesh;
//slider declare
ControlP5 controlP5;
int Chamfer = 100;
void setup(){
size(500, 500, OPENGL);
hint(DISABLE_OPENGL_2X_SMOOTH);
hint(ENABLE_OPENGL_4X_SMOOTH);
noSmooth();
//slider setup
controlP5 = new ControlP5(this);
controlP5.addSlider("Chamfer",0,255,128,200,0,100,10);
HEC_Cube cube = new HEC_Cube(this).setEdge(100);
mesh = new HE_Mesh(cube);
HEM_ChamferCorners cc = new HEM_ChamferCorners().setDistance(10);
mesh.modify(cc);
fill(000);
//slider setup
GComponent.globalColor = GCScheme.getColor(this, GCScheme.GREEN_SCHEME);
GComponent.globalFont = GFont.getFont(this, "Serif", 11);
sdrScale = new GVertSlider(this, 0, 0, 10, height);
sdrScale.setLimits(200, 0, height);
sdrScale.setInertia(1);
zoomfactor = 45.0f / height;
zoom = 0.1 * zoomfactor * sdrScale.getValue();
initialize();
}
void draw(){
pushMatrix();
translate(width/2, height/2, -200);
noStroke();
background(000);
lights();
scale(zoom);
fill(255);
stroke(255);
for(int i=0;i<p.length;i++){
p[i].update();
translate(width/2, height/2, -200);
p[i].draw();
}
popMatrix();
}
void initialize() {
num=int(random(1,5));
p=new Particle[num];
for(int i=0; i<num; i++) {
p[i]=new Particle();
}
}
void handleSliderEvents(GSlider slider){
zoom = zoomfactor * slider.getValue() * 0.1f;
}

//Particle class
class Particle{
Particle(){
}
void update(){
rotateX(frameCount*PI/150);
rotateY(frameCount*PI/170);
rotateZ(frameCount*PI/90);
}
void draw(){
fill(#79d11a);
noStroke();
mesh.drawFaces();
noFill();
stroke(0);
mesh.drawEdges();
saveFrame("hemesh-chamfercorners.png");
}
}

Replies(2)

andreas.s..

hi, although you have declared variable Chamfer inside your sketch, it is never used when running your sketch, therefore changes for slider Camfer will have no effect. just for testing purposes, change background(000); to background(Chamfer); inside your draw function and make changes to the slider.

frederikw..

Re: hemesh-controlp5 question

2 years ago

Unlike big 3D programs hemesh doesn't keep a dynamic stack of modifiers for each mesh. If you modify a mesh all you get is a new mesh without any memory of applied modifers. This also means that changing a modifier after it was applied does nothing to the modified meshes.

If you want a dynamic modifier you need to recreate the mesh inside update():

HEC_Cube cube = new HEC_Cube(this).setEdge(100);
mesh = new HE_Mesh(cube);
float someChamfer=slider.getValue();
HEM_ChamferCorners cc = new HEM_ChamferCorners().setDistance(someChamfer);
mesh.modify(cc);

You should add some check to avoid regenerating the mesh when nothing has changed. Also it might be better to work with two meshes, an unchangeable basemesh and a modified copy mesh. This way you can avoid the often expensive creator in update():

mesh = basemesh.get();
float someChamfer=slider.getValue();
HEM_ChamferCorners cc = new HEM_ChamferCorners().setDistance(someChamfer);
mesh.modify(cc);

have fun!

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