Deformable snowfield grid drawing method and device

Abstract

The invention discloses a method and a device for drawing a deformable snowfield grid. The method comprises the following steps: calculating a distance field texture map between an initial snowfield grid and a static object grid; clustering the vertexes of the dynamic object grid to determine a bounding ball of each vertex cluster, wherein the bounding balls of all clusters form a bounding body of the dynamic object grid; pre-drawing a current snowfield grid to obtain a depth map and a geometric normal map with the same dimension; calculating snowfield deformation and updating a deformation map according to the depth map and the geometric normal map corresponding to the current snowfield grid, the bounding volume of the dynamic object grid and the dynamic object transformation matrix; performing down-sampling on the deformation chartlet for multiple times to obtain marked deformation area chartlets of different grades, and calculating that when any edge of a triangular patch of the current snowfield grid intersects with the marked deformation area chartlets, performing subdivision on the triangular patch. According to the deformation map or the distance field texture map, displacement adjustment in the normal direction is carried out on the snowfield piece elements, so that deformation of the current snowfield grid is achieved.

Description

technical field [0001] The invention belongs to the field of computer graphics, in particular to a method and device for drawing deformable snow grids. Background technique [0002] In recent years, many games and simulation systems have integrated various weather effects, including rain, snow, fog, etc. Among them, snow is a relatively complex weather effect that has a greater impact on the scene, and snow scenes often require a special production process. Many games and other applications simulate snow by simply modifying textures and materials. In the real snow scene, the snow will also respond to the movement and rotation of dynamic objects such as pedestrians and cars, and produce deformation effects such as extrusion, depression, and bulge; at the same time, the snow is at the junction of static objects and the ground. Accumulation occurs, but the above effects are not widely used in real-time interaction, and cannot be achieved by simply modifying textures and mater...

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Problems solved by technology

This method is also unable to realize the deformation drawing of the snow

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