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How to make one object gradually disappear as it passes through some object (e.g. teleportation gates)? How to make it gradually appear in other gates?

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For a basic effect, you could animate the transparency.

Almost all UI properties are animatable, You can keyframe them by right clicking and selecting Insert Keyframe (1 or I), or hovering over the value pressing I.

Also see

You could keyframe the transparency out as your object enters one gate, then keyframe the object location to move it to the other gate (or use a duplicate object) and keyframe the transparency back.

Cycles:

You can do this in Cycles by using a mix node and animating the factor:

enter image description here

Blender Internal:

This can be done in BI by enabling Transparency in Properties > Materials and animating the Alpha:

enter image description here

Other methods:

Another way you could try is using a Boolean modifier to remove parts of the object as it intersects it. You could then have a duplicate of the object moving out of another boolean cube to make it appear the sections are teleporting:

enter image description here

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  • $\begingroup$ this will make whole object to appear/disapper, right? but teleportation assumes that part of the object which is not yet teleported is fully visible, other is fully invisible $\endgroup$ – retif Nov 25 '13 at 19:26
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    $\begingroup$ @retif I'm not sure what you mean. Do you want the objects to disappear in sections? Could you add some example images? $\endgroup$ – gandalf3 Nov 25 '13 at 20:51
  • $\begingroup$ boolean modifier method is great, exactly what i wanted, thanks! -) $\endgroup$ – retif Nov 25 '13 at 23:35

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