Deforming by formula at Openframeworks Essential tutorial

beginners
1 
ofSpherePrimitive sphere;
ofEasyCam cam;
ofxPanel gui;
ofxIntSlider countX;
ofLight light;
ofMaterial material;

ofxFloatSlider rad, deform, deformFreq, extrude;

vector<ofPoint> vertices0;

//--------------------------------------------------------------
void ofApp::setup(){

gui.setup( "MixerGroup", "setting.xml" );
gui.add( rad.setup("rad", 250, 0, 500) ) ;
gui.add( deform.setup("deform", 0.3, 0, 1.5) ) ;
gui.add( deformFreq.setup("deformFreq", 3, 0, 10) ) ;
gui.add( extrude.setup("extrude", 1, 0, 1) ) ;

sphere.set(250,20);
vertices0 = sphere.getMesh().getVertices();     /* No viable overloaded '=' */

}

//--------------------------------------------------------------
void ofApp::update(){

vector<ofPoint> &vertices = sphere.getMesh().getVertices();
/* Non-const lvalue reference to type ‘vector’ cannot bind to a value of unrelated type ‘vector<glm::tvec3<float, glm::packed_highp>>’ */

for (int i=0; i<vertices.size(); i++) {
    ofPoint v = vertices0[i];
    v.normalize();
    float sx = sin (v.x * deformFreq);
    float sy = sin (v.y * deformFreq);
    float sz = sin (v.z * deformFreq);
    v.x += sy * sz * deform;
    v.y += sx * sz * deform;
    v.z += sx * sy * deform;
    v *= rad;
    vertices[i] = v;
    
}

}

//--------------------------------------------------------------
void ofApp::draw(){

light.setPosition ( ofGetWidth()/2, ofGetHeight()/2, 600);
light.enable();
material.begin();
ofEnableDepthTest();

cam.begin();
ofSetColor ( ofColor::white ) ;
sphere.draw() ;
sphere.setGlobalPosition( ofGetWidth()/2, ofGetHeight()/2, 0 ) ;
cam.end();

}
//--------------------------------------------------------------

I’m beginner of OF. When I followed the description of books to deform sphere, the error comes up. I make wrong code bold. please check it out. Thank you.

2

That book is old, copy and paste code from there is not working most of the time. Here the error is that sphere.getMesh().getVertices(); is returning, since OF 0.98 (more or less), a vector<glm::vec3>, not a vector<ofPoint>. That’s why the compiler is telling you

Non-const lvalue reference to type vector cannot bind to a value of unrelated type vector<glm::tvec3<float, glm::packed_highp>>

Try to change the update method to something like:

void ofApp::update(){
  vector<glm::vec3> &vertices = sphere.getMesh().getVertices();
  for (int i=0; i<vertices.size(); i++) {
    auto v = glm::normalize(vertices0[i]);
    float sx = sin (v.x * deformFreq);
    float sy = sin (v.y * deformFreq);
    float sz = sin (v.z * deformFreq);
    v.x += sy * sz * deform;
    v.y += sx * sz * deform;
    v.z += sx * sy * deform;
    v *= rad;
    vertices[i] = v;
  }
}

And change:

vector<ofPoint> vertices0;

to:

vector<glm::vec3> vertices0;

In your header file.

3

It works!! really thank you!! and I have to throw away this book (I bought this last month…:<)

4

Hi, I hope you don’t mind this thread necromancy, but I have a problem with your solution. I too am following the book, I have made the modifications you specified, but I get an error:

vector<glm::vec3> &vertices = sphere.getMesh().getVertices();
for (int i = 0; i < vertices.size(); i++)
{
    auto v = glm::normalize( vertices0[i]);       
    float sx = sin( v.x * deformFreq );
    float sy = sin( v.y * deformFreq );
    float sz = sin( v.z * deformFreq );
    v.x += sy * sz * deform;
    v.y += sx * sz * deform;
    v.z += sx * sy * deform;
    v *= rad;                             // call to implicitly-deleted copy constructor of ofxSlider<float>
    vertices[i] = v;
}

Any help would be much appreciated!

5

Hi, can you please post the error you get? Otherwise is quite hard to provide help.
cheers

6

The error i get:

call to implicitly-deleted copy constructor of ofxSlider<float>
7

/home/eamoc/CODE/OpenFrameWorks_Examples/VideoSynth/src/ofApp.cpp:97: error: use of deleted function ‘ofxSlider::ofxSlider(const ofxSlider&)’
v *= rad;
^~~
/home/eamoc/MyStuff/openFrameworks/addons/ofxGui/src/ofxSlider.h:8: error: use of deleted function ‘ofxInputField::ofxInputField(const ofxInputField&)’
/home/eamoc/MyStuff/openFrameworks/addons/ofxGui/src/ofxInputField.h:14: error: use of deleted function ‘ofEventListeners::ofEventListeners(const ofEventListeners&)’
/home/eamoc/MyStuff/openFrameworks/addons/ofxGui/src/ofxSlider.h:8: error: use of deleted function ‘ofEventListener::ofEventListener(const ofEventListener&)’
class ofxSlider : public ofxBaseGui{
:-1: error: Process failed with exit code 1.
:-1: error: The following products could not be built for configuration qtc_Test123_Debug:
:-1: error: VideoSynth
/home/eamoc/CODE/OpenFrameWorks_Examples/VideoSynth/src/ofApp.cpp:97: error: call to implicitly-deleted copy constructor of ‘ofxSlider’
^~~~~~~~~

8

well I would guess that rad is an ofxSlider object.
does it work if you try changing

v *= rad;

for

v = v * rad;
9

its an ofxFloatSlider object, which is ofxSlider.
when I replace
v = rad;
for
v = v * rad;
as you suggest, I get a different error:
/home/eamoc/CODE/OpenFrameWorks_Examples/VideoSynth/src/ofApp.cpp:97: error: no match for 'operator’ (operand types are ‘glm::tvec3<float, (glm::precision)0>’ and ‘ofxFloatSlider’ {aka ‘ofxSlider’})
v = v * rad;
^~~

???

10

Hi,
I really dont like using ofxFloatSlider instead I use ofParameters which are more flexible. It is just a different approach on using ofxGui.
does it work if you use instead
v = v * float(rad);

1 Like
11

Hi,
That worked!!
Im following the code in “openFramework essentials” but it seems to be out of date.
Thanks for your help. I never would have tried that

E.

12

Glad to know.

The error you posted was suggesting it. stuff you learn along the way :slight_smile:

Actually the "openFramework essentials” book is quite outdated and there are a lot of questions here in the forum regarding it. It would be great if the author, or maybe someone else, made an update to that code.

13

Well,
if I ever get tot he end of it, I’ll post mine
:slight_smile: