Merging 2 meshes into 1.
Merging objects.

 

Step1:
Get a BOX!

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Step2:
Hit "CNTRL-D" and move the new box over.

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Step 3:
Select both boxes using "shift+spacebar". Then Use the "Raycast-Polygon"(Y) tool and select the two pollies that are facing eachother.

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Step4: Delete the polygons by hitting del.
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Step5: Go to Create>Poly.Mesh>Merge
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Step6: Lookie at that pop-up. Drag the slider up till it conjoins the vertices. (Any slider in XSI can go beyond the slide limits,
eg. my slider is at 4)
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Step7: You can also click in the "blend" check box. What this will do is fill the space between the two objects with pollies.
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Step8: Drag the new "merged" object up so we can see the source models.
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Step9: Now as you can see if we start editing the older objects the "new merged" geometry starts to move with it. This is useful for a lot of various reasons.
But we want to delete the old "un-merged" objects. If we delete them now the "new-meged" object will go with it. Thats because when they are merged
there is history atomatically created so that we could if necesary got back and edit them. But for now we don't want them.
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Step10: In order to remove the history on the new object we must "freeze" it. This clears the history of an object. (The "immed" button next to freeze basically freezes
while you work. Good for dense polygon models, as the histories can become huge.)
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Step11: Now you can delete those old boxes...just select them and press delete.
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Step12: Another thing that happens when you merge to pieces of geometry is material clusters are kept from the old objects. This means that each box
is gonna transfer its material to the new object. We don't want those clusters in this case senario so we delete them. Go to "clusters" and shift select the
two "ClsMat" nodes and press delete.
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Step13: And Voila! Merged Geometry ;)
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