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[[File:polymesh1.png|800px]]
Converting a pyramid to a polymesh object.
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<b>Modifying a Polymesh Object</b>
Each polymesh object is made up of a number of nodes, edges and faces. You can access the individual nodes, edges or faces. The '''Mode''' section of the property dialog has three radio buttons labeled '''Node''', '''Face''' and '''Edge'''. When the Node Mode is selected, a small red ball at the location of the selected node. You can cycle through all the nodes from the '''Active Node''' box or using the keyboard's '''Up Arrow''' or '''Down Arrow''' keys. The world coordinates of the active node are displayed in the property dialog. You can change these values and fine tune the position of any node. You can also delete the selected node by clicking the '''Delete''' button next to the node index.
When the Face Mode is selected, the perimeter of the active face is highlighted as a red triangle. You can cycle through all the faces from the '''Active Face''' box or using its spin buttons. The world coordinates of the centroid of the active face are displayed in the property dialog, but they are greyed out and cannot be edited. However, you can insert a new node at the location of the centroid of the active face and split it into three new smaller faces. To do so, click the '''Insert''' button of the dialog. At this time, a temporary local coordinate system is established at the centroid of the selected face with the local X-axis parallel to the first edge of the selected face and the local Z-axis normal to the plane of the selected face. The three active node coordinate boxes in this case represent the offset coordinates of the '''New Node'''new node. You have an opportunity to type in new offset values to modify the location of the new node.
When the Edge Mode is selected, the active edge is highlighted as a red line segment. You can cycle through all the edges from the '''Active Edge''' box or using its spin buttons. The world coordinates of the midpoint of the active edge are displayed in the property dialog, but they are greyed out and cannot be edited. However, you can insert a new node at the location of the midpoint of the active edge and split it into two new smaller edges. To do so, click the '''Insert''' button of the dialog. As a result of this operation, the two triangular faces sharing the selected edge are split into four new smaller faces. At this time, a temporary local coordinate system is established at the midpoint of the selected edge with the local X-axis parallel to the selected edge and the local Z-axis normal is aligned along the average of the normal vectors of the two triangular faces sharing that edge. The three active node coordinate boxes in this case represent the offset coordinates of the '''New Node'''new node. You have an opportunity to type in new offset values to modify the location of the new node.
{{Note|Inserting new nodes on faces allows you to increase the mesh resolution locally at certain selected cells. Inserting new nodes on edges allows you to expand a polymesh object outward from its boundaries.}}
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[[File:polymesh2_tn.png|400px]] [[File:polymesh3_tn.png|400px]]