Skinning vector graphics with GANs

Simple Methods to Represent Shapes with Sample Spheres

“…We describe simple methods to represent given shapes with sample spheres. We have evaluated our methods for 2D vector graphics applications including element synthesis [Hsu et al 2020] and shape warping [Phogat et al 2019], and plan to explore applications in 3D modeling. We also plan to perform more comprehensive analysis and comparisons against other methods.…”

“…To meet our first objective, we place points uniformly along the boundary and randomly in the interior of the input shape, and sort all the points first on y-axis and then on xaxis. From this sorted point set, we pick up uniformly separated [Phogat et al 2019] Our SEC method Figure 6: Comparison with Adobe Illustrator Puppet Warp automatic pin placement [Phogat et al 2019]. The results for [Phogat et al 2019] were directly screen-captured and thus have different rendering effects from our results.…”

“…From this sorted point set, we pick up uniformly separated [Phogat et al 2019] Our SEC method Figure 6: Comparison with Adobe Illustrator Puppet Warp automatic pin placement [Phogat et al 2019]. The results for [Phogat et al 2019] were directly screen-captured and thus have different rendering effects from our results. Notice that the samples produced via [Phogat et al 2019] might miss key parts of the shapes, while our results can provide more balanced coverage.…”

“…handles for deformation [Jacobson et al 2011;Phogat et al 2019], or element distribution for design [Hsu et al 2020]. Depending on the design choice, the same element (purple) can be represented in different ways, such as 1 sample for a rigid component (left), 2 samples for a mildly deformable shape (middle), and 8 samples to allow further deformation among the two branches (right).…”

“…The Puppet Warp tool in Adobe Illustrator has a machine-learningbased method for automatic pin placement [Phogat et al 2019], but it often produces undesirable outcomes, such missing symmetries and leaving one part of the shape inconsistent with the other (Figure 6). ξ ← user specified spacing ratio ∈ [0 ∞) compute MAT/SAT T of a given element e // [Amenta et al 2001;Steenkamp 2019] sample set S ← ∅ for each polar ball b ∈ T in decreasing radius do include ← true for each b ′ ∈ S do if b cent er − b ′ cent er < ξ b r adius + b ′ r adius then include ← f alse end end if include then S ← S + b end end return S Algorithm 1: Element sampling via touching polar balls from a MAT/SAT tree.…”