Programmable Rendering of Line Drawing from 3D Scenes

摘要

This article introduces a programmable approach to nonphotorealistic line drawings from 3D models, inspired by programmable shaders in traditional rendering.rnThis approach relies on the assumption generally made in NPR that style attributes (color, thickness, etc.) are chosen depending on generic properties of thernscene such as line characteristics or depth discontinuities, etc.We propose a new image creation model where all operations are controlled through user-definedrnprocedures in which the relations between style attributes and scene properties are specified. A view map describing all relevant support lines in the drawingrnand their topological arrangement is first created from the 3D model so as to ensure the continuity of all scene properties along its edges; a number of stylernmodules operate on this map, by procedurally selecting, chaining, or splitting lines, before creating strokes and assigning drawing attributes. Consistent accessrnto properties of the scene is provided from the different elements of the map that are manipulated throughout the whole process. The resulting drawing systemrnpermits flexible control of all elements of drawing style: First, different style modules can be applied to different types of lines in a view; second, the topologyrnand geometry of strokes are entirely controlled from the programmable modules; and third, stroke attributes are assigned procedurally and can be correlatedrnat will with various scene or view properties. We illustrate the components of our system and show how style modules successfully encode stylized visualrncharacteristics that can be applied across a wide range of models.