getAngle function

[dongju.jeong]

What does diffrent this function compare to the getAngle(vec3,vec3) function?

Edited January 10, 2019 by dongju.jeong

[fox]

Hi Dongju,

As written in the docs,  the getAngle(v0,v1) function returns an unsigned acute angle between the two vectors (the smaller of the two possible angles). The result is within the [0.0; 180.0] range.

While the getAngle(v0, v1, up) function returns a signed angle relative to the up vector specified. The result is within the [-180.0; 180.0] range.

float getAngle(const vec3 &v0, const vec3 &v1)
{
	float d = dot(v0, v1) / (length(v0) * length(v1));
	return acos(clamp(d, -1.0f, 1.0f)) * RAD2DEG;
}

float getAngle(const vec3 &v0, const vec3 &v1, const vec3 &up)
{
	vec3 n = cross(v0, v1);
	return atan2(dot(normalize(up), n), dot(v0, v1)) * RAD2DEG;
}

Thank you!

[dongju.jeong]

What is the range of values returned by node->getRotation()->getAngle()?

0~360 or -180~180?

[silent]

dongju.jeong

Quote

 The result is within the [-180.0; 180.0] range for getAngle(v0, v1, up).
 The result is within the [0.0; 180.0] range for getAngle(v0,v1).

 

[dongju.jeong]

I want value of range about quat->getangle() not Math's getAngle().

quat->getAngle() range is 0~180 too???

 

I checked with Log, it looks like -180~180. 
Thank you for your answers.

Edited February 8, 2019 by dongju.jeong

[silent]

Result will be in the [-180.0;180.0] range for quat->getAnlge().