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2018-06-28T20:46:15Z

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wiki>Rking: Topher77's video. /* Animation */

2012-01-31T23:44:27Z

Topher77's video. ‎Animation

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= Mask Transparency =

Mask Transparency is a special kind of transparency (to see the other two modes, visit: [[Doc:2.6/Manual/Materials/Properties/Raytraced Transparency|Raytraced Transparency]]). Instead of making objects transparent/translucent, it hides the geometry behind it.

= Show Background =

[[Image:Manual-Materials-Properties-Mask_Transparency-00.Input.png|center]]
Our first example is [[Media:Manual-Materials-Properties-Mask_Transparency-00.blend‎|Manual-Materials-Properties-Mask_Transparency-00.blend‎]]. The "Blender" text has its Transparency set to Mask with an Alpha of zero, and we set up a fancy procedural background in the World settings. When we render, the text masks off all objects going all the way to the background:

[[Image:Manual-Materials-Properties-Mask_Transparency-00-result.png‎|center]]

Notice the background peeking out to the right, by the backdrop---but also notice that it's piercing through everything where our "Blender" text is!

= Render Layers =

Here is our next example, which uses the Compositor to selectively overlay Blender-rendered images over a photo. The key elements are:
# The hand was modeled, and set to a Transparency type Mask with Alpha 0.
# The Compositor uses an AlphaOver to apply the render over the photo.
# There is a fake "shadow-catcher" geometry, which has had these settings:
#* Shadow > Shadows Only was checked, plus "Shadows and Distance" was changed to "Shadows Only"
#* Traceable turned off (so it doesn't cast shadows)

Here is the .blend: [[Media:Manual-Materials-Properties-MaskTransparency.blend|Manual-Materials-Properties-MaskTransparency.blend]]

Before: [[Image:Manual-Materials-Properties-MaskTransparency-Before.png|thumb|Image before hacks.]]
{{clr}}
After [[Image:Manual-Materials-Properties-MaskTransparency.png|center|frame|Another demonstration of Mask Transparency]]
{{clr}}

= Animation =

These techniques do not only have to apply to static images. You can get some amazing video effects.

Here is such a video: [http://www.youtube.com/watch?v=KhQ9spXBwIc Sky Columns of Mystery].

And here is the .blend for that: [[Media:Manual-Material-Properties-MaskTransparency-SkyColumns.blend|Manual-Material-Properties-MaskTransparency-SkyColumns.blend]]
An additional interesting aspect of that .blend is that it uses the VSE to composite {{literal|Scene}}s, not Images. There is no intermediate render step, and Masking works to pierce through one scene to show another without a problem.

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wiki>Rking: Topher77's video. /* Animation */

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