"Random" texture

[gerald_d]

Anybody have ideas how to create a "random" texture like this?:


12996.jpg

Something like a faux adze finish, or "hand-hewn". Can one use a spreadsheet and a random-number generator as an example......?

[benchmark]

Hi Gerald

I know that you can do this in Artcam....(The expensive route), or use Vectric Vcarve or PhotoVcarve.... use a vector drawing of a wood grain, for a tighter pattern I have copied and then pasted the vectors with an offset then V carved it with a ball cutter. Have you tried Vcarve yet ?


Paul

[edcoleman]

Gerald:

How about using the shopbot image converter? Take a digital pic of the surface and run it through the converter to create a sbp file. Playing around with the image first (contrast/brightness etc) might be necessary.

-Ed

[gerald_d]

Hi Paul, I havn't tried the Vectric VCarve, because we have another VCarve program that has been adequate till now.

That enlarged area in the pic above is actually a bit wrong for me - it shows "weathered grain" while I want adze marks. The grain and v-carve will give the type of detail in the enlargement. But I think I am looking for short "chop" marks in the grain direction.

Does Vectric VCarve handle ball bits?

[gerald_d]

This is the type of pattern that I think a round-nosed adze would leave, if it was CNC controlled!:


13001.gif

....but the geometry must be much more "human" and not CNC-perfect.

[gerald_d]

Reckon if I plunge a ball cutter at the top of each red line, then cut along the line but raise the z as it goes to the other end....


13003.gif

If I put a whole lot of perfect red lines into a spreadsheet, then use a random generator to apply an error in x,y to each end of the line........?

[benchmark]

Gerald

Vcarve handles ball nose cutters... maybe I can create some hand carved files for you.

13007.jpg

[gerald_d]

Paul, that looks like the dog's bollocks - perfect.


We have a 50mm ball nose, probably going 6mm deep at the most for this pattern.

Could you lay out a dxf of a "tile" say 300 to 400 square where the edges will match up? I can handle vertical arcs in G-code, so I am looking for a dxf that probably has only one arc per "facet"

[stevem]

Paul, how about a short lesson on how you did that with VCarve.

[jhicks]

Not sure how you did that but its "Way Cool" Guess I need to stay tuned to this. If its a tool path and strategy that one can deploy with simple lines and V cut geometry to "Elevate and and lower" the z on a round over/ ball nose, please explain further. I can envision a technique but you obviously have it down.