We present a hybrid point and triangle primitive based streaming viewer
for triangular meshes. The advantage of using such a mixture of
rendering primitives is that, while points can accelerate object
display rendering, rendering selective objects using triangles can
compensate for the degradation in image quality caused due to the point
based rendering. We have based our system on an existing point based
renderer, QSplat, and extended it to incorporate triangle based
rendering. The extension achieves a vast improvement in the quality of
the rendered image as compared to QSplat. Like QSplat, the system is
meant to be deployed in environments with moderate network bandwidths
(e.g. LAN). Technical Report An Earlier Approach: A purely
point based approach
In this approach, we build a dual graph of the triangular model
and run
a BFS on the dual graph and stream vertices across. The advantage of
this approach is compactness: connectivity is implicit in the order of
streaming, since the dual graph is more or less 3-regular. The
disadvantage is
that filling in the gaps between these vertices is not easy. Also view
dependent streaming is difficult. The following are some images
produced during streaming using this algorithm.
The number on the top of each figure denotes the number of
vertices drawn. With as little as 5000
vertices (~8% of the model) we start to get a decent idea of the model
being streamed.
The Hand
Model
915
1369
