check camera forward is facing downward

LuckyJoey

于 2018-01-13 15:25:52 发布

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分类专栏： C#_算法

本文链接：https://blog.youkuaiyun.com/u014732824/article/details/79051678

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本文介绍了一种在Unity中实现的方法，当检测到主摄像机朝向下方时，通过一系列向量运算来定位并旋转一个用于寻找焦点的正方形。此过程包括计算正方形的位置及确保其正对摄像机。

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//check camera forward is facing downward
			if (Vector3.Dot(Camera.main.transform.forward, Vector3.down) > 0)
			{

				//position the focus finding square a distance from camera and facing up
				findingSquare.transform.position = Camera.main.ScreenToWorldPoint(center);

				//vector from camera to focussquare
				Vector3 vecToCamera = findingSquare.transform.position - Camera.main.transform.position;

				//find vector that is orthogonal to camera vector and up vector
				Vector3 vecOrthogonal = Vector3.Cross(vecToCamera, Vector3.up);

				//find vector orthogonal to both above and up vector to find the forward vector in basis function
				Vector3 vecForward = Vector3.Cross(vecOrthogonal, Vector3.up);


				findingSquare.transform.rotation = Quaternion.LookRotation(vecForward, Vector3.up);

			}