Camera tips for Unity3d technology-the size of the cones from the camera to a given distance

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The size of the cones from the camera to a given distance

The View cone cross-section from the camera to a certain distance is defined as a rectangle in world space, including the visible area box. Sometimes this is useful for calculating the size of the rectangle at a given distance, or for finding the size of a given rectangle. For example, if a moving camera needs to always take a full shot of an object (such as a player), it cannot get too close, or part of the object cannot be snapped.

The height of the cones at a given distance (the units of both are world units) can be obtained by the following formula:-

var frustumheight = 2.0 * Distance * Mathf.tan (Camera.fieldofview * 0.5 * Mathf.deg2rad);

...... The process can be reversed to calculate the desired distance to obtain the specified cone height:-

var distance = Frustumheight * 0.5/mathf.tan (Camera.fieldofview * 0.5 * Mathf.deg2rad);

The calculated FOV angle is also possible with the known height and distance:-

var Camera.fieldofview = 2 * Mathf.atan (Frustumheight * 0.5/distance) * MATHF.RAD2DEG;

Each formula contains a cone height, which can be easily obtained by width (and vice versa):-

var frustumwidth = frustumheight * camera.aspect;
var frustumheight = Frustumwidth/camera.aspect;

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Camera tips for Unity3d technology-the size of the cones from the camera to a given distance