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Messages - dfix

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Support / Re: calcAngle returns "NaN"
« on: May 02, 2017, 12:05:14 pm »
Yes, that makes sense,

I have an array of "jellyfish" that randomly move around the world, however, once they are a certain distance away, I need them to come back into the centre of the camera view.  I'm struggling to see how I can derive the correct rotation that points to the centre of the camera view.(the camera is static)

Code: [Select]
private void animate()
        if (aniFrame > 0)
            ind += INC_FRACTION * aniFrame;

            if (ind > 1) {
                ind -= 1;
                aniFrame = 0;
            for (int i = 0; i < jellyFishAmount; i++)
                jellyFishClones[i].animate(ind);                //apply the new animation frame
                movedDistance[i] += MOVE_SPEED;                 //increase the directional change
                if (roam[i]&&aniFrame%2==0)                     //only change direction every second call and if the jellyfish hasn't left the "safe area"
                if (centerVec.distance(jellyFishClones[i].getTranslation()) > 200f)
                    if (roam[i])
                        movedDistance[i] = 0;     
                    roam[i] = false;
                    if (centerVec.distance(jellyFishClones[i].getTranslation()) < 10f)
                        roam[i] = true;                         //set the jellyfish back to randomly roaming
                directionalVec[i] = jellyFishClones[i].getZAxis();         

Support / Re: calcAngle returns "NaN"
« on: May 02, 2017, 04:24:16 am »
Changing the first vector's Z value from 0 to a negative number returns a correct value;

Code: [Select]
                v=new SimpleVector(0f,0f,-10f);
                ov=new SimpleVector(0f,0f,10f);
Now I get:

I/jPCT-AE: angle:3.1415927

which I was expecting from 0 also

Is it impossible to calculate an angle with one vector having an absolute value of 0?

Support / calcAngle returns "NaN"
« on: May 02, 2017, 04:13:53 am »
Hi, Can someone help me?

I am trying to calculate the angle between two vectors, but the only results I get are "NaN". I am sure it is something I am doing wrong...

Code: [Select]
 v=new SimpleVector(0,0,0);
ov=new SimpleVector(1,1,10);
float angle = v.calcAngle(ov);

The Android Monitor just outputs:

I/jPCT-AE: angle:NaN


Pages: [1]