![]() ![]() There may be some specialized tools for doing this otherwise, but with built in ArcMap tools this can be done even with multiple layers, you'll just have to get clever with erasing the correct sections at the correct times based on your extrusions. You'll end up with two version of your buildings where the 3D slice was erased. Since the slice is a large block covering everything above (or below) your slice erasing everything from the buildings layer inside it will result in a building layer that has the respective opposites left. Once you have this large area that should be covering the upwards or downwards portions of your buildings you can use Difference 3D to subtract it from your initial building multipatch. These features must be created using ArcObjects, either from existing geometries (how buildings are extruded in ArcScene and ArcGlobe) or from raw data sources. Typically you would extrude it enough to cover the entirety of your building features. The multipatch feature cannot be created in normal edit sessions in ArcMap as with the standard ESRI geometry types. Keep in mind for fairly advanced features you may want to check that they are closed properly with tools such as Is Closed 3D and Enclose Multipatch, otherwise their could be issues with calculations later.įrom here, you can use default capability by taking your "slice" layer which I'm assuming is a 3D polygon and extruding into two versions- upwards and downwards (don't forget to multipatch the outputs as well). Which will ensure they are in a proper 3D format for calculations. What can typically be done is for you to convert your extruded layers into Multipatches using the tool 3D Layer To Multipatch. However, I want to apply textures and edit the roofs, so I need to convert them to multipatch. I extruded them in scenes and set elevation property to 'On the Ground' and it appears perfectly (see attached). In the case of polygon features, top and base faces are created to connect to the extruded walls to construct a closed shape.Įach feature is extruded to the specified z-value from a field or expression as a flat top, regardless of the z-values of each feature.I don't believe ArcGIS has a default tool for "slicing" in 3D. I have a polygon feature class of building footprints. A z-value is calculated for each vertex of the feature's base and each feature is extruded to those z-values. This option is not available for point features.Īdd extrusion to each vertex of each feature's base height. They are extruded to a flat top at that value. A z-value is calculated by adding the extrusion height to the maximum z-value of each feature. This option is not available for point features.Īdd extrusion to each feature's maximum height. A z-value is calculated by adding the extrusion height to the minimum z-value of each feature. ![]() This is the default.Īdd extrusion to each feature's minimum height. Choose a feature extrusion type.įeatures are not extruded. On the layer's contextual tab (for example, the Feature Layer tab), in the Extrusion group, click the Type drop-down arrow.Select the layer you want to extrude in the Contents pane.You can extrude points based onĪn attribute to create columns of different lengths to visually representĪ comparison of point features on the ground and point features extruded to lines is shown below: ![]() Extrusion is a good way to highlight locations in 3D. Point and multipoint features become hollow vertical columns when extruded, regardless of the point symbol applied. If more than one layer is selected in the Contents pane, extrusion choices are unavailable. The image below shows the multipatch icon. Credit: ArcGIS Also, the icon next to a multipatch feature is a 3D feature. Multipatches can be 3D surfaces or 3D solids (volumes). You can only extrude a single layer at a time. Multipatch features are 3D objects that represent a collection of patches to present boundary (or outer surface) of a 3D feature. The 2D Layers category in the Contents pane, it is moved to the 3D Layers category. ForĮxample, you can extrude building polygons by a height value toĬreate three-dimensional building shapes. In this exercise you have created 3D features, extruded point features, and interpolated a raster surface from a set of data points. A flat, 2D shape vertically to create a 3D object in a scene. ![]()
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