helpp!!

https://cycling74.com/forums/how-to-use-jitter-for-projection-mapping

hello so I'm still struggling to find a way to map on a sphere and I read you can use spout to export a video into madmapper. I dowloader the 2 but they dont seem to connect to one another even with the jit.gl.spoutsender object. https://1024d.wordpress.com/2011/06/10/maxmspjitter-to-madmapper-tutorial/ I can't seem to get it working. The 2 links mentioned earlier dont seem to allow the user to project on a sphere.

to map to a sphere you can simply use @tex_map 2 (sphere map)

make sure you've gone through the video and graphics tutorials for some jitter basics : https://docs.cycling74.com/max8/tutorials/00-VGindex

thx :) but once the video is on the sphere I want to do some projection mapping so could need a way to apply the cornerpin object to the sphere and thats what i dont know how to do

You could capture the sphere to a texture with jit.gl.node.

thx!!

Curious... on my machine—MacBook Air 2017, OSX 10.16.6, Max 8.1.1—the mapping appears to not be on a sphere but a 2D circle, i.e. there's no distortion toward the edges of the sphere. ???

yeah... you are right! for some strange reason it's definitely not a sphere more like a circle with a slight slight 3d. I don't know how to make it a real sphere

Hi, let's bump this thread as the involved questions are a little beyond my knowledge and may also require more precise wording of requirements.

a) Rob has proposed to use @tex_map 2 (sphere map). In the following links it is explained what a sphere map is supposed to do. A sphere map is a 2D representation of the full 360-degree view of the scene surrounding of an object, as if taken through a fish-eye lens. So I think the behaviour that you report is no bug, but it seems not to meet your expectations, so you have to specify more precisely what you mean with "map on sphere" (e.g. What distortion is expected? Number of projectors?). https://www.opengl.org/archives/resources/code/samples/advanced/advanced97/notes/node95.html https://www.opengl.org/archives/resources/code/samples/advanced/advanced97/notes/node94.html

b) There is plenty of mapping software e.g.

http://tecartlab.com/?fbclid=IwAR06kcNf0E1WtXu4vBRsA4LNN_msQ--HtEbzuDzUHXWOLRO24UarWNnWHWA

that allows for sophisticated mapping. Maybe you find more information or a more convenient solution there.

With regards to a), whatever expectations I might have had were based on a posted code fragment that suggested a solution to achieving sphere mapping. The example is incomplete in that it loads a file that is not a sphere map. It's an incomplete example and fails to demonstrate the technique that Leila was enquiring about but rather leads to further confusion.