Deferred Warping

Abstract

We introduce deferred warping, a novel approach for real-time deformation of 3D objects attached to an animated or manipulated surface. Our target application is virtual prototyping of garments where 2D pattern modeling is combined with 3D garment simulation which allows an immediate validation of the design. The technique works in two steps: First, the surface deformation of the target object is determined and the resulting transformation field is stored as a matrix texture. Then the matrix texture is used as look-up table to transform a given geometry onto a deformed surface. Splitting the process in two steps yields a large flexibility since different attachment types can be realized by simply defining specific mapping functions. Our technique can directly handle complex topology changes within the surface. We demonstrate a fast implementation in the vertex shading stage allowing the use of highly decorated surfaces with millions of triangles in real-time.

Real-time Rendering of Small-scale Volumetric Structure on Animated Surfaces

“…Deferred warping [2] allows you to attach detail geometry without need to store all of it in memory. While it's useful for attaching mid or high scale details, it's still suffers, as other geometric methods, from increasing computational cost when the amount of details becomes big, while their scale becomes small.…”

“…The common disadvantage of all of these methods is the necessity to process all of the detail geometry, which makes them not scalable in terms of processing time: without special handling through levels of detail, it will increase if scale of the details will decrease. Also, only [2] directly supports free deformation of the base surface.…”

“…Such approach is fast, but coarse. So, there are multiple techniques to accurately represent complex structure on surfaces either directly by geometry [1][2][3] or implicitly through volumetric texturing [4][5][6] without need to construct all of the details by hand.…”