TRIMMED CURVE

Slim trim curve means reasonably good flow... 

D CAD/modeler Free-form surfaces, parametric geometry, trim curves, surface/material properties, assembly information Tessellation (static dynamic), data reduction (LOD), siuface properties — > textures, materials, reflection mapping... 

Figure 3-5 illustrates how surfaces build up the geometry in a boundary. The geometry of boundary Bj consists of four fiat and two curved surfaces, as well as intersection lines and curves. Flat surfaces are defined by trimming. This operation is a restriction of a surface by a closed chain of lines called a trimming curve. S y is a surface primitive and is created by using two curves applying one of the basic rules of surface creation. Surface S4 is created by... 

Frequency behavior DC to 3 GHz (Locus diagram) of buried resistors (a) 10 Q/n, (b) 100 12/ (trimmed curve after high-voltage pulse trirnming). 

The schema provides for regular conic curves (e.g. circle, ellipse, etc.), and quadric surfaces (e.g. cylinder, cone, etc.). Each of these has a specified parameterisation which must be adhered to when providing parameter values for other entities (e.g. trimmed curves). This is an attempt to exclude the idea of default parameterisation, the interpretation of which may differ from one implementation to another. In addition, parametric curves and surfaces are provided for by B-spline entities. These are specified by their control points, and may be rational or non-rational, uniform or non-uniform. Bezier representation of curves and surfaces is provided as a... 

CLASS( ELEMENTARY CURVE(d), TRIMMED CURVE(d), COMPOSITE CURVE(d), INSTANCE(CURVE(d)), CASE d OF... 

This entity type represents all bounded curves. It consists of the trimmed curves and those conics that are bounded by their geometric definition. The purpose of introducing this entity type is to guarantee that the result of a wireframe model is always bounded. 

COMPOSITE CURVE provided that point 1 of the first TRIMMED CURVE and point 2 of the last TRIMMED CURVE representing the first and last segment of the composite curve are references to the same point entity (represented by the same name on the neutral file). 

ENTITY TRIMMED CURVE = GENERIC (d DIM) STRUCTURE curve... 

The TRIMMED CURVE entity defines a section out of the definition range of the elementary curve referenced. The curve is to be evaluated between the parameter values starting at parameter 1 and going to parameter 2. 

If a TRIMMED CURVE has the attributes point 1 (corresponding to parameter 1 if sense is. T. and corresponding to parameter 2 of sense is. F.) and point 2 (corresponding to parameter 2 if sense is. T. and corresponding to parameter 1 of sense is. F.) it is considered to to start and terminated exactly in the points referenced. The receiving system will have to check whether the parametric representation satisfies this condition within the accuracy requirement as specified in the corresponding world attribute. 

The COMPOSITE CURVE is a sequence of no of segments segments each of which is represented by a TRIMMED CURVE. The TRIMMED CURVE entities when used in this context must have the point 1 and point 2 attributes. Furthermore, the point 2 attribute for each segment must be a reference to the same point entity as the point 1 attribute of the subsequent segment. If the COMPOSITE CURVE is to be considered as a CLOSED CURVE the point 2 attribute of the last segment and the point 1 attribute of the first segment must refer the same point entity. 

ENTITY TRIMMED CURVE ON SURFACE = STRUCTURE surface curve... 

TRIMMED CURVE ON SURFACE ( name logical, [name], [name] ) ... 

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