koobas.hobune.stream
Fade color depending on Angle (angle 360° instead of 180°)
Greetings people.
First of all, I want to warn you that I’m a noob and just starting out with Unity and scripting. So thank you in advance for taking time to read this.
I have different points of information on an object marked by World Space GUI buttons and dots (images).
Here is an explanatory photo.
I have an Orbit camera that rotates around the object and can zoom in and out.
What I want to achieve is that when I rotate towards the back of the object, the Button and dots on the back have a stronger color (alpha “color” is higher) while the two buttons in the front fade to 30% of their alpha “strength”.
I don’t want the zoom function to influence the fade, that’s why I thought it would be more convenient to work with Angle instead of Distance. But I only want to take into account the angle while I rotate in the Y-axis (from back to front ◄-►). I want to ignore the angle when I rotate Up-Down ▲-▼.
I used Vector3.Angle, but I can’t make it ignore the Up-Down rotation and my second problem is that with Vector3.Angle, the back and the front are both 90°. I need to differentiate back and front, so I would need a number from 0° to 360° or -180° to 180°.
I always calculate the Angle between the camera and the center where it is aiming at. I read in another answer that I should use Vector3.Dot, Vector3.Cross and Mathf.Sign. I tried to, but since I’m a noob the results weren’t as expected. I’ll be very thankful for any help or guidance in the right direction.
unity's Vector3.Angle is always returning the nearest angle between two vectors, here's how I did to know the angle on clockwise direction (Y-Axis)
float angle(Vector3 from, Vector3 to)
{
//Set 'to' vector so 'from' always Vector3.forward
Quaternion q = Quaternion.FromToRotation(from, to);
//Get rotation, the resulting value are between -180 to 180
return angleY(q*Vector3.forward);
}
float angleY(Vector3 v)
{
if (v.z > 0)
return Vector3.Angle (Vector3.forward, v);
else
return -Vector3.Angle (Vector3.forward, v);
}
please note that to make this works, the Y value on both vector are always zero
