Applying Displacement maps to meshes?

Replies to This Discussion

Permalink Reply by peter fotiadis on June 30, 2016 at 10:52am

Get a flat demo for the moment and I'll try to find some other stuff as well

Attachments:

• Map_the_Lord_V1.gh, 120 KB

Permalink Reply by Kim hauer on June 30, 2016 at 11:17pm

There are many examples for flat surface displacements at this forum. But none that wrap around a mesh. The Glass.3dm would require a simple Cylindrical mesh that would project the displacement map around the glass. other forms would be Spherical, Box, Normal projection. 

Houdini also appears to offer some interesting possibilities:

http://www.z-way.org/script-and-gizmo/houdini/houdinimodeling

 

Permalink Reply by Laurent DELRIEU on June 30, 2016 at 11:45pm

Hello Kim
There are displacement on mesh not flat. For example reaction diffusion vase, I used a numeric value on each point of the mesh. If you want an image to bump it is doable you will have to transform Cartesian coordinates to polar coordinates. X and Y are transformed to an angle. You will have to multiply angles from 0 2pi by the number of copies you want around. The same in z. The most " difficult" is if you don't want bump inside the glass so you will have to know if point is interior or exterior. It is doable with some logic on normal and point position.
If you want a script please post the bump you need ( image or equation) interior exterior ... And I could give it a try !

Permalink Reply by Kim hauer on July 1, 2016 at 9:37am

Hi Laurent
It really does not matter which displacement map I chose, almost any image converted to black and white should work, naturally the grey tones introduce softer depth relationships.Your Maze stuff certainly works! ...bravo!I'm wondering if you can generalize your Maze GH stuff to include maps?  here is the glass rendered with the map ... using opacity

Permalink Reply by Laurent DELRIEU on July 1, 2016 at 1:23pm

Hello Kim,

here is a first  script for generating polar displacement between 2 heights. It is best to have good triangulation, because here most of the mesh are where there is no details. But it works. You need weaverbird. 

Permalink Reply by Laurent DELRIEU on July 1, 2016 at 3:47pm

Kim here

http://www.grasshopper3d.com/forum/topics/maze-from-mesh?commentId=...

I made a mesh which could be used to generate seamless map of Maze. At the moment there is just the geometry, you will have to make the map.

Permalink Reply by Kim hauer on July 2, 2016 at 9:13am

I think I was overly optimistic, about the quality of image displacement to applied geometry. Even a high quality converted vector to raster graphics image, has no influence on the quality of the displacement.

I was not expecting image displacement to be of the quality shown in the Maze-Heart pic above. In most instances some of my Image maps are barely indistinguishable from each other, when applied to the Mesh, this could improve by choosing a smaller repeating pattern sample.

Permalink Reply by Kim hauer on July 2, 2016 at 10:46am

Realistic for glass that is molded! :)

Permalink Reply by Kim hauer on July 2, 2016 at 7:38am

Thanks Laurent, when experimenting with your script, I have to be very careful

about setting the H max H min values

Permalink Reply by Laurent DELRIEU on July 2, 2016 at 1:08pm

Why careful ?  

Permalink Reply by Pieter Segeren on July 2, 2016 at 1:45pm

when I set the Hmin to 5, the pattern appears on the inside of the glass. Could be what Kim meant. I was too busy doing other things to take time to investigate this further...

Permalink Reply by Laurent DELRIEU on July 2, 2016 at 3:00pm

There is a little error in my script. I wanted to let user to invert B&W so to go from 0  (black) to 1 (white) to 1 (black) to 0 (white). But equation if(x,y-1,y) must be replaced by if(x,1-y,y) !!! So now bump is good according to normal. I also have strange results with no update with a slider change !! I need the use of recompute. 

Attachments:

• displacement_map.gh, 911 KB

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