Images and Pictures - IRIT:
Click on the following images for a full size view:
Metamorphosis of freeform surfaces
This sequence of three images is a samples of a small animation created
by a metamorphosis process of freeform NURBs surfaces.
Matching of freeform curves
A matching algorithm is introduced to generate an improve metamorphosis
of freeform curves. The left shows direct convex combination while the
right shows the result of applying the matching algorithm. Note the
back and tail of the oryx.
Sculptured Surface Modeling
This model of the B58 plane was modelled using the IRIT modeling
environment and raytraced using the
rayshade
ray tracer.
Another high quality scene that was modelled using the IRIT modeling
environment and raytraced using the
rayshade
ray tracer. This scene
as well as the B58 above were constructed using various freeform
surface modeling tools such as ruled surface (wings of B58), surface
of revolution (the table and dishes), sweep (the cushion and base of
chairs), and skinning (the fuselage of the B58). Similar geometries
such as the engines of the B58 or the chair were instantiated several
times using rigid motion transformations.
Depth Cueing based Rendering
Rendering with depth cueing for both rendered using
rayshade
images (left) and postscript figures (right).
The postscript version also supports haloed lines. Both examples
were created using tools that are part of the IRIT modeling environment.
Line Art Rendering
Adaptive extraction of isoparametric curves is employed herein to
create illustrative imagery exploiting diferent shaders. The image on
the left enhances silhouette regions while the image on the right uses
cosine shader.
Ruled Tracing
Ruled tracing of adaptive isoparametric curves is a novel rendering
technique to directly scan convert freeform parametric surfaces. Herein,
special affects such as texture and bump mapping are intermixed with
shadow computation. No polygnal approximation of the freeform surfaces
is involved in this process. Joint work with Postech, Korea.
Curvature Analysis of Freeform Surfaces
In this sequal, three images of the Utah Teapot are shown with color maps
that represents the Gaussian (left), Mean (middle), and sum of squares
of principle curvatures (sqrt(k1^2 + k2^2)). These curvature properties
were computed as scalar fields using tools provided in the IRIT modeling
environment, were represented in piecewise polynomial parametric form,
and were rendered back on top of the Utah Teapot using the IRIT rendering
tool that supports texture mapping of scalar fields. In all three images,
Red denotes high values, Blue low values, and Green intermediate values.