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Iskander

How to bake/render "inverse panorama" of the object.

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You can set up an inward cylindrical projection (based screen coordinates ranging from -1 to 1) like this:

vector pos = v@P * M_PI;
float r = chf('radius');
float h = chf('height');

v@P.x = sin(pos.x) * r;
v@P.z = cos(pos.x) * r;
v@P.y *= h;

v@N = normalize( v@P * {-1, 0, -1} );

Inside a lens shader v@P would be called P and v@N would be I.

Unfortunately SideFX recently changed the way to create CVEX operators. Does anyone know how to use CVEX in Houdini 17?

 

Also make sure to check out Paul Ambrosiussen´s tutorial (for H16.5): https://www.sidefx.com/tutorials/lens-shaders-for-gamedev/

inverse_panorama.hiplc

inverse_panorama.png

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