Displacement Script

[supern00b]

Just exploring python a bit and made a really simple function that roughly mimics displacement mapping but it actually generates the mesh within the 3d window.

from Blender import *
from Blender.NMesh import *

Base = Image.get("Image")
#You must import an image called "Image" into Blender
o = Object.GetSelected()[0]
data = o.data
name = data.name
mesh = NMesh.GetRaw(name)

def create(mesh, image, depth, scale):
	xs = image.getSize()[0]
	ys = image.getSize()[1]
	#Verts
	y = 0
	while y<ys:
		x = 0
		while x<xs:
			pixel = image.getPixelF(x, y)
			value = (pixel[0] + pixel[1] + pixel[2])/3
			newx = scale*x
			newy = scale*y
			newz = value*depth
			newvert = Vert(newx, newy, newz)
			mesh.verts.append(newvert)
			x = x + 1
		y = y+1
	#Faces
	l = len(mesh.verts)
	for can in range(l):
		if can > xs*(ys -1) -10:
			pass
		else:
			v1 = mesh.verts[can]
			v2 = mesh.verts[can + 1]
			v4 = mesh.verts[can + xs + 0]
			v3 = mesh.verts[can + xs + 1]
			newface = Face([v1,v2,v3,v4])
			mesh.faces.append(newface)
	#Finish
	NMesh.PutRaw(mesh, name)

create(mesh, Base, 0.1, 0.1)

The problem I have at the moment, as you will find if you run the script, is that there are faces created between the vertices on the far right and the vertices on the next line on the far left. Any ideas on how to eliminate this? At the moment I just manually delete the vertices son the far right.

[taniwha]

Originally Posted by supern00b #Faces l = len(mesh.verts) for can in range(l): if can > xs*(ys -1) -10: pass else: v1 = mesh.verts[can] v2 = mesh.verts[can + 1] v4 = mesh.verts[can + xs + 0] v3 = mesh.verts[can + xs + 1] newface = Face([v1,v2,v3,v4]) mesh.faces.append(newface) #Finish The problem I have at the moment, as you will find if you run the script, is that there are faces created between the vertices on the far right and the vertices on the next line on the far left. Any ideas on how to eliminate this? At the moment I just manually delete the vertices son the far right.

Your face creation loop is too simple: you need to work in a grid fassion rather than linear. This is untested, but should give you the idea:

    for y in range (ys - 1):
        for x in range (xs - 1):
            v1 = mesh.verts[(y + 0) * xs + 0]
            v2 = mesh.verts[(y + 0) * xs + 1]
            v3 = mesh.verts[(y + 1) * xs + 1]
            v4 = mesh.verts[(y + 1) * xs + 0]
            newface = Face([v1,v2,v3,v4])
            mesh.faces.append(newface)

Of course, you could do it in a single loop, but you would need to skip the last column of each line (if not ((can + 1) % xs): continue) and the final row (for can in range (len(mesh.verts) - xs): ...). However, with such code, what you are doing is nowhere near as clear as the nested loop approach, so I don't recommend it

HTH

[supern00b]

Thanks very much. I'll give it a shot over the weekend.

[jazzroy]

a working script already exists, check here:

http://www.dedalo-3d.com/index.php?f.../abstract.html

[SHABA1]

Originally Posted by jazzroy a working script already exists, check here: http://www.dedalo-3d.com/index.php?f.../abstract.html

jazzroy: That script is very very picky about the type of image you use to do the displacement. I think a better choice would be the one noted on this thread.

http://www.elysiun.com/forum/viewtopic.php?t=47639

[ideasman42]

Originally Posted by SHABA1 Originally Posted by jazzroy a working script already exists, check here: http://www.dedalo-3d.com/index.php?f.../abstract.html jazzroy: That script is very very picky about the type of image you use to do the displacement. I think a better choice would be the one noted on this thread. http://www.elysiun.com/forum/viewtopic.php?t=47639

I guess you found my script, but I made my script to replace makeHumens displacement tool- Checkout my site.

[supern00b]

That's a nice script. Yeah, I was just dabbling.