Turtle graphics, move without drawing question

@irv wrote:

Hello,

I am trying to create a 3D Turtle. I have successfully been able to draw a line from (x,y,z) to (x',y',z') using ofPolyline lineTo and addVertex methods.

My issue arises when I try to move to another point without drawing. Is there a way I could do this using ofPolyline, or should I try another way? Which way, how?

Here is some of my code;

.h:

ofPolyline line;

.cpp:

float xCoord = 250.0;
float yCoord = 250.0;
float zCoord = 250.0;
// -------- Vector variables
float xVec = 1;// x of vector
float yVec = 0;// y of vector
float zVec = 0;// z of vector

//--------------------------------------------------------------
void ofApp::setup(){
ofBackground(0,0,0);
    ofPoint pt;
    pt.set(xCoord , yCoord, zCoord);
    camDist  = 1000; // set the camera distance
    cam.setDistance(camDist);
    }

void ofApp::keyPressed(int key){
switch(key)
{
case 102:
        {
            xCoord = xCoord + (xVec * stepSize);
            yCoord = yCoord + (yVec * stepSize);
            zCoord = zCoord + (zVec * stepSize);

         ofPoint pt;
         pt.set(xCoord, yCoord, zCoord);
         line.addVertex(pt); line is an ofPolyline

//  // this also works:
//  line.lineTo(xCoord, yCoord, zCoord);
}
break;
}

The question is how would I make it move without drawing, leave a gap, and then draw again without connecting to previous point. I tried leaving the addVertex method out by doing this:

case 70:// F, move forward but not draw  // --------------------------------
        {
            xCoord = xCoord + (xVec * stepSize);
            yCoord = yCoord + (yVec * stepSize);
            zCoord = zCoord + (zVec * stepSize);

            ofPoint pt;
            pt.set(xCoord, yCoord, zCoord);// sets a point and then draws the line to that point
        }

but as soon as I drew another line it would connect to the last drawn point.
Any help or suggestion is welcome.

Thanks!
Irv.

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