by Ron K. Lussier
This tutorial explains how to use a procedural cone to get flat disc effects for eye iris', planet rings and simple shockwaves.
The right object:
A primitive cone, with very little height, can do a few tricks by the nature of it's mapping.
The mapping coordinates generated by a cone are like tapered
cylindrical coordinates. If you have a cone with a height value of say 0.01, and then have
a smaller value for Radius1 setting than Radius2, the
cone sides become a disc, with virtually flat, circular mapping coordinates.
1. Create a Cone like the one described above, turn on "Generate Mapping Coordinates"
2. Assign a Multi-Material for the pupil/iris
2. Add a Volume Select modifier and, in SubObject mode, from a top view of the cone, 2D-scale the Gizmo so it is inside both Radius 1 and Radius 2.
3. Switch to Face and Crossing
4. Add a DeleteMesh modifier, Animate the radii for the shockwave.
A Cone has it's materials pre-defined as ID1=Top, ID2=bottom,
ID3=sides. A Multi-Material with ID1 as black and ID3 as the colored iris map will give
you near perfect iris mapping that will distort 'properly' when you change the pupil
diameter (Radius 1 of the Cone object).
Assign a Bitmap to the iris material. It would look something like this...
(TBD) For a shockwave effect you will want to animate both the Inner and Outer radii of the Cylinder outward, and animate a Noise map, or similar effect, along the V coordinate to achieve radial motion. The most effective way to do this is to move the Noise "upward" so that it moves outward a bit slower than the overall motion of the shockwave...
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