Marcelo Mellado

I'm trying to recreate a moon using the textures and displacement images provided by the nasa web page (

https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4720

 ). The displacement image they provide consist on a grayscale image which tells the height of the craters in the sphere, otherwise the moon would be a smooth ball. 

I asume I can get this to work with gen, outputing a matrix from a gridshape(sphere), then i would have to operate its position array with the displacement.png in a matrix, making it move forwards and inwards in specific coordinates of the sphere, but I'm not 100% sure what kind of math I should apply here, it surely displace the sphere but it does not seems I'm applying it correctly. Any help would be appreciated. (Max file attached below)

Other question is, why when I operate the displacement and enable the lighting, appears a linear hole? I think it is because i'm not using maths right 

image.png

luna.maxpat

I'm trying to recreate a moon using the textures and displacement images provided by the nasa web page (https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4720 ). The displacement image they provide consist on a grayscale image which tells the height of the craters in the sphere, otherwise the moon would  be a smooth ball.  
I asume I can get this to work with gen, outputing a matrix from a gridshape(sphere), then i would have to operate its position array with the displacement.png in a matrix, making it move forwards and inwards in specific coordinates of the sphere, but I'm not 100% sure what kind of math I should apply here, it surely displace the sphere but it does not seems I'm applying it correctly. Any help would be appreciated.  (Max file attached below)

Other question is, why when I operate the displacement and enable the lighting, appears a linear hole?  I think it is because i'm not using maths right 


I'm trying to recreate a moon using the textures and displacement images provided by the nasa web page (https://svs.gsfc.nasa.gov/cgi-bin/de

how to properly generate a displacement in a sphere from the center