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3<title>Combining Meshes</title>
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9<h1>Combining Meshes</h1>
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11Exporters execute an optimization process called node compression in order to reduce the total number of nodes so as to improve processing efficiency during data export. (<a href="CommonCompressNode.html">Click here for details</a>).<br> When using node compression, if multiple nodes are combined to form a single node, meshes belonging to that node are combined to form a single mesh as much as possible.  This is called combining meshes.<br>
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14<h2>Problems With Visibility Control</h2>
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16Mutliple meshes are gathered together to form a single mesh when combining meshes.<BR> Only part of the combined mesh can be shown or hidden.<BR> In such cases, combining meshes must be control to prevent the all forming one mesh.<BR>
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19<h2>Mesh Combine Control Method</h2>
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21There is more than one method of controlling combining meshes.<BR> We recommend a method that uses combine groups.
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23<h3>Specifying a Combine Group</h3>
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25You can limit mesh combinations outside the same group by specifying a combine group number.<BR> The combine group setting uses the NW4C Set Combine Group plug-in provided for each CG tool.
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28<h3>Preventing Nodes from Combining</h3>
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30Because this is performed as a result of node combine, meshes will not be combined if node combine is prevented.  The prvent node combine setting uses the NW4C Set No Compress Node plug-in provided for each CG tool. <BR> This method suffers from the disadvantage of a slightly greater execution load because the number of nodes cannot be reduced.
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33<h3>Assigning Different Materials</h3>
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35Meshes are not combined if another material is assigned to a mesh.<BR> This method suffers from the disadvantage that the execution load is increased because the number of materials increases. (The overhead for executing processes that apply material settings in hardware is high.)<BR>
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