Need Ideas for Canyon Rock

I'm trying to make a canyon rock texture - something like this: http://farm3.static.flickr.com/2660/3...ce1c_o.jpg or this: http://www.robhamanphotography.com/fi...utah-9025/

I have the hard shadows covered, and I think doing the layers will be easy enough, but I'm struggling to come up with a way to do the general shape of the rock. Most of the rock stuff I've done has been more rounded, so perlin, cells, stones, etc. work well. This rock is very angular, so I need sharp linear profiles. It would be nice if we could set the perlin to have different interpolation (linear interpolation would probably be faster, too). I tried using different profiles curves for perlin, but didn't have any luck. I also had an idea to have a linear curve repeated and map perlin to the number of repeats, but it wouldn't let me do that (probably wouldn't have tiled, anyway).

Any other ideas?

And here is halfway implementing interpolation on Y... not what I expected, but it gives me an idea for a creative photo filter.

Here is a test image of that method (with additional micro details and coloring)

Thanks! That method looks like it has potential as well.

Woah!
This looks really cool. Would love to see any progress you make

Getting closer to the texture I want...

Too bad this tiles so horribly right now.

-- Written by Nathan "jitspoe" Wulf
-- 2011-03-07

function prepare()
maxX = get_intslider_input(REPEAT_X)
maxY = get_intslider_input(REPEAT_Y)
pointTable = {}
math.randomseed(get_intslider_input(MY_VARIATION))

for y = 0, maxY do
pointTable[y] = {}
for x = 0, maxX do
pointTable[y][x] = math.random()
end
end

end;

function get_sample(x, y)
local xIndex = math.floor(x * maxX)
local distBetweenX = x * maxX - xIndex
xIndex = xIndex % maxX
local yIndex = math.floor(y * maxY)
local distBetweenY = y * maxY - yIndex
yIndex = yIndex % maxY
local xIndex2 = (xIndex + 1) % maxX
--local yIndex2 = (yIndex + 1) % maxY
--local vY1a = pointTable[yIndex][xIndex]
--local vY1b = pointTable[yIndex2][xIndex]
--local vY2a = pointTable[yIndex][xIndex2]
--local vY2b = pointTable[yIndex2][xIndex2]
--local vX1 = (vY1a * (1 - distBetweenY)) + (vY1b * distBetweenY)
--local vX2 = (vY2a * (1 - distBetweenY)) + (vY2b * distBetweenY)
--local vX2 = pointTable[yIndex][xIndex2]
local vX1 = pointTable[yIndex][xIndex]
local vX2 = pointTable[yIndex][xIndex2]
local v = (vX2 * distBetweenX) + (vX1 * (1 - distBetweenX))
local r = v
local g = v
local b = v
local a = 1
return r, g, b, a
end;

Combined with the hard shadows filter, which I've already submitted.

It's probably just as effective to use multiple noise gradients with a 128 (grey) base color, and an extreme L Range.

Looks very nice already

I think I may be done.

Something like this? Not sure what it'd be useful for, but I suppose it can't hurt.

Oh, and the canyon wall filter has been submitted..

I think it could be useful for a number of things. It reminds me of pictures or notes pinned to a wall. Could be fun with different images in each tile or a jumbled version of the background image. Then add some pins and you got a new filter

Only problem with the offsetting is that you will get slight repeated sections of the image.

Quote
Getting closer to the texture I want... Too bad this tiles so horribly right now. Posted: September 13, 2012 11:23 pm

I actually like how this one looks, any way to change up the settings to make it look like that? or is this one lost as a beta ?

You won't be able to get it to look exactly the same, but you can probably get something similar. Unfortunately, I don't remember what types of settings you would use to get that.