2,259 research outputs found
Art Directed Watercolor Shader for Non-photorealistic Rendering with a Focus on Reflections
In this research, I demonstrated that emulating painterly reflections is impossible using
existing modeling, compositing and rendering software that does not provide programming
capabilities. To obtain painterly reflections, we need to emulate three aspects of
painterly reflections: (1) shape of reflections; (2) glossiness of reflections; and (3) colors
of reflections. The first two turn out to be relatively easy. However, despite the perceived
simplicity of color reproduction, the third one turned out to be hardest without developing
our own proprietary tools.
To demonstrate the difficulty, I have developed a shader using commercial rendering
and shading software that does not provide explicit programming power. I assigned my
shader as a surface material to 3D objects. Using my shader, I was able to create computer
generated watercolor style renderings without reflections. My shader provide rendering
effects such as diffuse, contours, specularity, shadow, and reflections. Although I can
faithfully emulate non-reflected regions of given water-color paintings, I demonstrate that
my shader cannot produce reflection colors that are faithful to colors of original reflections
Stroke-based Neural Painting and Stylization with Dynamically Predicted Painting Region
Stroke-based rendering aims to recreate an image with a set of strokes. Most
existing methods render complex images using an uniform-block-dividing
strategy, which leads to boundary inconsistency artifacts. To solve the
problem, we propose Compositional Neural Painter, a novel stroke-based
rendering framework which dynamically predicts the next painting region based
on the current canvas, instead of dividing the image plane uniformly into
painting regions. We start from an empty canvas and divide the painting process
into several steps. At each step, a compositor network trained with a phasic RL
strategy first predicts the next painting region, then a painter network
trained with a WGAN discriminator predicts stroke parameters, and a stroke
renderer paints the strokes onto the painting region of the current canvas.
Moreover, we extend our method to stroke-based style transfer with a novel
differentiable distance transform loss, which helps preserve the structure of
the input image during stroke-based stylization. Extensive experiments show our
model outperforms the existing models in both stroke-based neural painting and
stroke-based stylization. Code is available at
https://github.com/sjtuplayer/Compositional_Neural_PainterComment: ACM MM 202
Painterly rendering techniques: A state-of-the-art review of current approaches
In this publication we will look at the different methods presented over the past few decades which attempt to recreate digital paintings. While previous surveys concentrate on the broader subject of non-photorealistic rendering, the focus of this paper is firmly placed on painterly rendering techniques. We compare different methods used to produce different output painting styles such as abstract, colour pencil, watercolour, oriental, oil and pastel. Whereas some methods demand a high level of interaction using a skilled artist, others require simple parameters provided by a user with little or no artistic experience. Many methods attempt to provide more automation with the use of varying forms of reference data. This reference data can range from still photographs, video, 3D polygonal meshes or even 3D point clouds. The techniques presented here endeavour to provide tools and styles that are not traditionally available to an artist. Copyright © 2012 John Wiley & Sons, Ltd
The Evaluation of Stylized Facial Expressions
Stylized rendering aims to abstract information in an image making it useful not only for artistic but also for visualization purposes. Recent advances in computer graphics techniques have made it possible to render many varieties of stylized imagery efficiently. So far, however, few attempts have been made to characterize the perceptual impact and effectiveness of stylization. In this paper, we report several experiments that evaluate three different stylization techniques in the context of dynamic facial expressions. Going beyond the usual questionnaire approach, the experiments compare the techniques according to several criteria ranging from introspective measures (subjective preference) to task-dependent measures (recognizability, intensity). Our results shed light on how stylization of image contents affects the perception and subjective evaluation of facial expressions
The Creation Process of a Stylized Character in Comparison to a Semi-realistic Character
Abstract
I. Introduction
a. Thesis statement: What is the process for modeling a stylized character and how does this differ from a semi-realistic character?
b. Expanded thesis statement: The two styles differ from start to finish in a variety of ways. I believe that semi-realistic characters require more source material when drawing and modeling; however stylized characters require a different level of creativity and artistic ability in creation. Modeling semi-realistic characters will be more dependent on source images while stylized characters may require special attention with non-standard texture, style, etc. Rendering techniques will also differ when it goes to presenting the final polished versions with the stylized character focusing on rendering styles that flatten the character while the semi realistic character will require rendering techniques that make it seem more real visually
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