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CGAShape Operations

CGA reference

Shape Operations

alignScopeToAxes operation alignScopeToGeometry operation alignScopeToGeometryBBox operation center operation cleanupGeometry operation color operation comp operation convexify operation deleteHoles operation deleteUV operation envelope operation extrude operation footprint operation i operation innerRectangle operation insertAlongUV operation label operation mirror operation mirrorScope operation NIL operation normalizeUV operation offset operation primitiveCone operation primitiveCube operation primitiveCylinder operation primitiveDisk operation primitiveQuad operation primitiveSphere operation print operation projectUV operation push/pop operation r operation rectify operation reduceGeometry operation report operation resetGeometry operation resetMaterial operation reverseNormals operation roofGable operation roofHip operation roofPyramid operation roofRidge operation roofShed operation rotate operation rotateScope operation rotateUV operation s operation scaleUV operation scatter operation set operation setback operation setbackPerEdge operation setbackToArea operation setMaterial operation setNormals operation setPivot operation setupProjection operation shapeLUO operations softenNormals operation split operation splitAndSetbackPerimeter operation splitArea operation t operation taper operation texture operation tileUV operation translate operation translateUV operation trim operation

Shape Attributes

comp shape attribute initialShape attribute material shape attribute material.color shape attribute material.map shape attribute pivot shape attribute scope shape attribute seedian shape attribute split shape attribute trim shape attribute

Built-in Functions

abs function acos function array initialization function asin function assetInfo function assetNamingInfo / assetNamingInfos functions assetsSortRatio function assetsSortSize function atan function atan2 function bool function boolArray function ceil function comp function contextCompare function contextCount function convert function cos function count function edgeAttr.getBool/Float/String function exp function fileExists function fileSearch / filesSearch function find function findFirst function float function floatArray function floor function geometry functions getGeoCoord function getMaterial function getTreeKey function imageInfo function imagesSortRatio function inside/overlaps/touches function isinf function isnan function isNull function len function ln function log10 function minimum distance function nColumns function nRows function p function pow function print function rand function readFloatTable/StringTable function readMaterial function readTextFile function rint function sel function setElems function sin function size function sortIndices function sortRowIndices function splitString function sum function sqrt function str function stringArray function substring function tan function transpose function

Operators

Array type operators colon operator index operator Simple types operators

Utility Library Functions

colorHexToB (color) colorHexToG (color) colorHexToH (color) colorHexToO (color) colorHexToR (color) colorHexToS (color) colorHexToV (color) colorHSVToHex (color) colorHSVOToHex (color) colorRGBToHex (color) colorRGBOToHex (color) colorRamp (color) assetApproxRatio (file) assetApproxSize (file) assetBestRatio (file) assetBestSize (file) assetFitSize (file) fileBasename (file) fileDirectory (file) fileExtension (file) fileName (file) fileRandom (file) imageApproxRatio (file) imageBestRatio (file) clamp (math) max (math) min (math) findFirst (string) findLast (string) getPrefix (string) getRange (string) getSuffix (string) replace (string) listAdd (string list) listClean (string list) listCount (string list) listFirst (string list) listFromArray (string list) listIndex (string list) listItem (string list) listLast (string list) listRandom (string list) listRange (string list) listRemove (string list) listRemoveAll (string list) listRetainAll (string list) listSize (string list) listTerminate (string list) listToArray (string list)

Other Keywords

attr const extension import start style version with

Miscellaneous Information

CGA changelog Annotations Asset and texture search Built-in assets and textures Context and occlusion queries Euler angles Texturing: Essential knowledge
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reduceGeometry operation

CityEngine 2023.0    |    |   Help archive
2024.12024.02023.12023.02022.12022.02021.1

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    Syntax

    • reduceGeometry(tolerance)

    Parameters

    1. tolerance—float
      Controls the number of vertices which are going to be removed from the geometry. Valid values are in the range [0,1]. For instance, a value of 0.2 will reduce the vertex count of the geometry by 20%.

    Description

    The reduceGeometry operation simplifies the geometry by applying a series of edge collapses. The algorithm tries to reduce the complexity of the mesh by introducing the least possible delta to the appearance of the existing model.

    Related

    • cleanupGeometry operation
    • convexify operation
    • innerRectangle operation
    • mirror operation
    • reverseNormals operation
    • setNormals operation

    Examples

    Reducing a terrain

    The picture below shows a shaded terrain mesh. Left: the original (16384 vertices, 16129 faces). Right: after reduceGeometry(0.8) (3276 vertices, 5066 faces).

    Terrain mesh before reduceGeometry
    Terrain mesh after reduceGeometry

    Terrain meshes

    Closeup of the terrain meshes from the previous picture. Left original, right reduced.

    Original geometry close up
    Reduced geometry close up

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