Blob Tree Trees
Date
2003-12-19
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Abstract
In recent years several methods for modelling botanical trees have
been proposed. The geometry and topology of tree skeletons can be well
described by L-systems, however there are several approaches to modelling
smooth surfaces to represent branches, and not all of the observed phenomena
can be represented by current methods. Many tree types exhibit non-smooth
features such as branch bark ridges and collars. In this paper we present a
botanical tree modelling approach that uses a hierarchical implicit modelling
system. The BlobTree provides several techniques to control the combination
of primitives, and allows both smooth and non-smooth effects to be combined
in a single blend volume in an easily controlled fashion. We use the
BlobTree to produce models of botanical tree branching structures that
capture smooth branching, branch collars and branch bark ridges in a single
model. The BlobTree is used as a procedural surface modelling system, taking
input from L-system botanical tree descriptions. We show that smooth, C1
continuous blends can be obtained without noticeable bulging, using summation
blending. We implement irregular effects using Precise Contact Modelling,
Constructive Solid Geometry and space warping.
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Computer Science