Näkymäfrustumi

Näkymäfrustumi refers to the visible portion of a 3D scene within a computer graphics or virtual reality application. It is the geometric region that the camera or viewer can perceive. Anything outside this frustum is not rendered, contributing to efficiency in real-time graphics. The frustum is typically shaped like a truncated pyramid, with a near clipping plane and a far clipping plane defining its boundaries.

The shape of the view frustum is determined by several parameters, including the field of view (FOV), which defines the angular extent of the visible scene, and the aspect ratio of the viewport. The near and far clipping planes are crucial for preventing rendering of objects that are too close or too far away, which can cause visual artifacts or performance issues. Objects that intersect the frustum are clipped accordingly, so only the visible parts are processed.

Understanding and correctly defining the view frustum is fundamental in computer graphics for tasks such as culling, projection, and ensuring accurate perspective. It directly impacts what the user sees and the performance of the rendering pipeline. In essence, it acts as a window through which the 3D world is viewed on a 2D screen or within a virtual environment.