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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