The TopPlane field represents the top plane of the frustum, oriented inwards. It is a part of the Frustum structure, which is used to define a 3D space that is typically used in rendering and visibility calculations. The TopPlane is one of the six planes that make up the frustum, each defining a boundary of the viewable area.
To access the TopPlane of a Frustum instance, you can simply reference it directly since it is a public field. This can be useful for collision detection, visibility checks, or other geometric calculations where the orientation and position of the frustum's planes are needed.
// Example of accessing the TopPlane of a Frustum Frustum frustum = new Frustum(); Plane topPlane = frustum.TopPlane; // Use the topPlane for further calculations or checks Vector3 normal = topPlane.Normal; float distance = topPlane.Distance; // Example of checking if a point is above the top plane Vector3 point = new Vector3(0, 0, 10); bool isAbove = topPlane.GetDistanceToPoint(point) > 0;