Systems and methods for particle-based digital airbrushing

摘要

A graphics application for simulating natural media drawing and painting may model a tablet stylus as if it were a virtual airbrush tool that sprays paint on a virtual canvas (tablet). The application may compute a conical shape of the paint spray, a target area in which to create an airbrush mark, and a target distribution of the paint to be deposited within the target area based on values of configurable parameters of the application and on 6DOF data collected from the tablet stylus and the tablet. The target distribution shape may be based on a hardness parameter. The virtual airbrush tool may create the mark using texture projection or by emitting multiple individual paint particles, which may have random sizes and velocity directions. In a hybrid mode, a granularity parameter may control the relative contributions of texture projection and particle emission in creating a given airbrush mark.

主权项

1. A method, comprising:
performing by a computer:
collecting information about the pose of a stylus that represents an airbrush tool during a stroke made by the stylus on a tablet;determining a conical shape with which to model paint spraying from the tip of the airbrush tool, the determining the conical shape comprises constructing a three-dimensional geometry representing the spray of the paint dependent on the collected information;determining a target area on a virtual canvas in which to deposit the paint, the determining the target area comprises determining an intersection of the three-dimensional geometry and the virtual canvas;determining a target distribution for depositing the paint within the target area;depositing paint within the target area on the virtual canvas dependent on the determined target distribution, the depositing paint comprises depositing at least a portion of the paint as a plurality of individual particles of paint sprayed on the virtual canvas by the airbrush tool; andstoring data representing an image that includes the deposited paint.