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Figure 2: Photorealistic presentation of a part of the palais.
MODELLING FOR PHOTOREALISTIC
PRESENTATION
McNeill's software package AccuRender offers the
opportunity of photorealistic presentation of 3D surface
or solid object models according to the AutoCAD
drawing editor. Materials and their structure can be
assigned to surfaces and objects. Light modelling and
defining environmental elements, such as sky and
clouds, background or ground planes are amongst the
features available. The complete software functionality
is available directly in the drawing editor.
Material and object properties. Material can be
assigned to an entity via the entity itself, via the layer or
the colour definition. Selection of material is possible
from libraries. Libraries can be mangaged by the user
himself by editing existing or importing new materials.
Those bitmaps can be generated by scanning photos.
Defining the base colour of a matrial includes diffuse
colour, reflectivity, transparency, gloss and glow.
Furthemore patterns such as wood, marble or granite
175
e.g. can be assigned to objects, called procedural
patterns.
Bitmaps are two dimensional patterns which are
wrapped around an object like elastic paper. The
material's scale is pre-defined and can be altered.
Automatic repetion of the material's shape results in
covering the complete object.
Object properties are pattern orientations, bitmap
areas from the object, surface changes by waves or
resolutions wich are directly assigned to the objects.
Materials, showing marble, wood or other patterns are
variant with the orientation. Assigned is the origin, as
well as the x and y direction related to the world co-
ordinate system within the AutoCAD editor. This as-
signment can be overloaded, so that the pattern of a
wooden furniture is automatically shown from the right
perspective.
Bitmaps require slightly different treatment. Dependig
on the repetition of rectangle areas intersection edges
can show different patterns.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996