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Vector interpolation

Started by Sir Valeq May 15, 2003 at 1:19 PM 0 replies 500+ views

Original Post

May 15, 2003 at 1:19 PM

Hi! I''d like to ask if there is any nicer way to interpolate between two vectors than D3DXVec3Lerp? I found the Hermite and CatmullRom funcs in the SDK, but I just don''t get them. I don''t know what are those tangent vectors... I would just like a nice interpolation, like slerp between quaternions. Did anyone work out such function? Any help will be appreciated. Thx in advance

quasar3d

131

quasar3d

May 15, 2003 at 2:13 PM

CatmullRom interpolates between two vectors, but it also needs the previous and next vector to make the line curved. There is a function for it in D3DX I think, but you can use also mine (which is of course much nicer

  
template <class T> T CatmullRom(const T &x1,const T &x2,const T &x3,const T &x4,float t)
{
	T ret;

	ret = (-x1 + x2 * 3 - x3 * 3 + x4) * (t * t * t);
	ret += (x1 * 2 - x2 * 5 + x3 * 4 - x4) * (t * t);
	ret += (-x1 + x3) * t;
	ret += x2 * 2;
	ret *= .5f;

	return ret;
}

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[edited by - Quasar3D on May 15, 2003 3:13:58 PM]

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