Real-time stylized rendering of 3D animated scenes

Abstract : The goal of stylized rendering is to render 3D scenes in the visual style intended by an artist.This often entails reproducing, with some degree of automation,the visual features typically found in 2D illustrationsthat constitute the "style" of an artist.Examples of these features include the depiction of light and shade,the representation of the contours of objects,or the strokes on a canvas that make a painting.This field is relevant today in domains such as computer-generated animation orvideo games, where studios seek to differentiate themselveswith styles that deviate from photorealism.In this thesis, we explore stylization techniques that can be easilyinserted into existing real-time rendering pipelines, and propose two novel techniques in this domain.Our first contribution is a workflow that aims to facilitatethe design of complex stylized shading models for 3D objects.Designing a stylized shading model that follows artistic constraintsand stays consistent under a variety of lightingconditions and viewpoints is a difficult and time-consuming process.Specialized shading models intended for stylization existbut are still limited in the range of appearances and behaviors they can reproduce.We propose a way to build and experiment with complex shading modelsby combining several simple shading behaviors using a layered approach,which allows a more intuitive and efficient exploration of the design space of shading models.In our second contribution, we present a pipeline to render 3D scenes in painterly styles,simulating the appearance of brush strokes,using a combination of procedural noise andlocal image filtering in screen-space.Image filtering techniques can achieve a wide range of stylized effects on 2D pictures and video:our goal is to use those existing filtering techniques to stylize 3D scenes,in a way that is coherent with the underlying animation or camera movement.This is not a trivial process, as naive approaches to filtering in screen-spacecan introduce visual inconsistencies around the silhouette of objects.The proposed method ensures motion coherence by guiding filters with informationfrom G-buffers, and ensures a coherent stylization of silhouettes in a generic way.
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Submitted on : Friday, May 24, 2019 - 3:08:13 PM
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Alexandre Bleron. Real-time stylized rendering of 3D animated scenes. Image Processing [eess.IV]. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAM060⟩. ⟨tel-02139204⟩

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