Hierarchical Rasterization of Curved Primitives for Vector Graphics Rendering on the GPU

Dokter, Mark; Hladky, Jozef; Parger, Mathias; Schmalstieg, Dieter; Seidel, Hans‐Peter; Steinberger, Markus

doi:10.1111/cgf.13622

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…e description of the stroke operator by Gosling et al (1989) indicates that early on, stroking was implemented by generating a llable region corresponding to the stroked region of a path and then drawing that derived llable region. Other recent path rendering systems explicitly state they take this approach (Dokter et al 2019;Ganacim et al 2014;Li et al 2016).…”

Section: Render a Filled Region Approximating The Stroked Regionmentioning

confidence: 99%

Polar stroking

Kilgard¹

2020

ACM Trans. Graph.

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Fig. 1. Polar stroking samples: A cubic Bézier segment with a cusp rendered properly with polar stroking while uniform parametric tessellation has no cusp, both using 134 triangles; B polar stroking improves the facet angles distribution compared to uniform tessellation, both using 126 triangles; C arc length texturing; D ellipse drawn as just 2 conic segments, one external; E complex cubic Bézier path (5,031 path commands, 29,058 scalar path coordinates) with cumulative arc length texturing; F centripetal Catmull-Rom spline. Stroking and lling are the two basic rendering operations on paths in vector graphics. e theory of lling a path is well-understood in terms of contour integrals and winding numbers, but when path rendering standards specify stroking, they resort to the analogy of painting pixels with a brush that traces the outline of the path. is means important standards such as PDF, SVG, and PostScript lack a rigorous way to say what samples are inside or outside a stroked path. Our work lls this gap with a principled theory of stroking. Guided by our theory, we develop a novel polar stroking method to render stroked paths robustly with an intuitive way to bound the tessellation error without needing recursion. Because polar stroking guarantees small uniform steps in tangent angle, it provides an e cient way to accumulate arc length along a path for texturing or dashing. While this paper focuses on developing the theory of our polar stroking method, we have successfully implemented our methods on modern programmable GPUs.

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Section: Render a Filled Region Approximating The Stroked Regionmentioning

confidence: 99%

Polar stroking

Kilgard¹

2020

ACM Trans. Graph.

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“…While real-time on the GPU, this method offers limited dynamic shape manipulation without costly re-computation of the mesh. To our knowledge, current research cannot support animated vector texture mapping in real-time applications (only precomputed static vector textures [130,131,132,106]).…”

Section: D Shape Interpolationmentioning

confidence: 99%

Art-Directed Composition in Dynamic Real Scenes

Petikam¹

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<p>Art direction is crucial for films and games to maintain a cohesive visual style. This involves carefully controlling visual elements like lighting and colour to unify the director's vision of a story. With today's computer graphics (CG) technology 3D animated films and games have become increasingly photorealistic. Unfortunately, art direction using CG tools remains laborious. Since realistic lighting can go against artistic intentions, art direction is almost impossible to preserve in real-time and interactive applications. New live applications like augmented and mixed reality (AR and MR) now demand automatically art-directed compositing in unpredictably changing real-world lighting. </p> <p>This thesis addresses the problem of dynamically art-directed 3D composition into real scenes. Realism is a basic component of art direction, so we begin by optimising scene geometry capture in realistic composites. We find low perceptual thresholds to retain perceived seamlessness with respect to optimised real-scene fidelity. We then propose new techniques for automatically preserving art-directed appearance and shading for virtual 3D characters. Our methods allow artists to specify their intended appearance for different lighting conditions. Unlike with previous work, artists can direct and animate stylistic edits to automatically adapt to changing real-world environments. We achieve this with a new framework for look development and art direction using a novel latent space of varied lighting conditions. For more dynamic stylised lighting, we also propose a new framework for art-directing stylised shadows using novel parametric shadow editing primitives. This is a first approach that preserves art direction and stylisation under varied lighting in AR/MR.</p>

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An improved midpoint rasterization algorithm implemented in FPGA

Xue

Wang

2023

Displays

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Hierarchical Rasterization of Curved Primitives for Vector Graphics Rendering on the GPU

Cited by 8 publications

References 34 publications

Polar stroking

Polar stroking

Art-Directed Composition in Dynamic Real Scenes

An improved midpoint rasterization algorithm implemented in FPGA

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