script for automatically inserting shape keys into action

Coding Python Support
1

Hi All, I am trying to write a python script that takes an input in some array and automatically insert key frames for shape keys. Since I am new to scripting, I dont have exact idea of modules. Please give me pointers for the following:

  1. Read entry from array --> This is usual python and I know what to do.
  2. Given a frame index, shape key index and a float, I know how much of a shape key is to be keyframed at given frame. --> How do I insert that key frame using python?

Thanks much in advance for the help…

2

a good start may be to look at the MDD importer, that imports shape keys into blender, its included in blenders CVS that youll need to run it.

3

Where do i find this script? I am stuck at the same question 2, and i cannot figure out how to set the value of the key (the slider) from a script.

If anyone know, please tell me…

4

keep track of new scripts in Blender
http://projects.blender.org/viewcvs/viewcvs.cgi/blender/release/scripts/?cvsroot=bf-blender&sortby=date#dirlist

5

Thanks, those will come in handy…

One question though: This script is working with Mesh (not NMesh), but Mesh does not have a key variable or a getKey() function like NMesh. If i try to do the same as in this script, writing ‘me.key’ with ‘me’ a Mesh will throw an exeption in the interactive console saying that Mesh has no attribute ‘key’.

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7

for MDD import I added a mesh.key variable for Mesh, (but thats only in the CVS)

8

Oh ok… So, I can not write the script using Mesh in 2.42a?
btw, Bernoulli, are you going to write the same script :slight_smile:

9

I am writing a script that will animate ocean surface using data that are simulated in Matlab. However, i will only have samples for each 10th frame or so, so using shape keys will give it a smooth motion.

I have allready written the script, with NMesh, but since i dont have my data yet, i am animating simple harmonic waves just to make sure the shape keys insertion works. It look good but the code need some tweaking.

10

That is very nice script. Is your script available somewhere?

11

Here it is. I left out some stuff though, but it needs some tweaking. I am going to create more functions (for cosmetics), and see if i can set some more attributes for the object.


import Blender as B
import math
import random


def create_nmesh(Xres, Yres, Xrange, Yrange, name):
	mesh = B.NMesh.New(name)
	for i in range(Yres+1):
		y = i*float(Yrange)/Yres
		for j in range(Xres+1):
			x = j*float(Xrange)/Xres
			mesh.verts.append( B.NMesh.Vert(x,y,0) )
	aface = range(4) # Just to have a length 4 list
	for i in range(Yres):
		for j in range(Xres):
			aface[0] = mesh.verts[ i*(Xres+1)+j ]
			aface[1] = mesh.verts[ i*(Xres+1)+j+1 ]
			aface[2] = mesh.verts[ (i+1)*(Xres+1)+j+1 ]
			aface[3] = mesh.verts[ (i+1)*(Xres+1)+j ]
			mesh.faces.append(B.NMesh.Face(aface))
	mesh.update()
	return mesh

def update_waves(mesh, time, k, theta, w, amp):
	# test version
	# Using n = len(k) harmonic waves
	for v in mesh.verts:
		x = v.co[0]
		y = v.co[1]
		z = 0
		for i in range(len(k)):
			z += amp[i]*math.sin( k[i]*math.cos(theta[i])*x + k[i]*math.sin(theta[i])*y - w[i]*time )
		v.co[2] = z
	mesh.update()



############
##  MAIN  ##
############

# "Delete" redundant objects
scn = B.Scene.GetCurrent()
#delete_objects(scn)
for o in scn.getChildren():
	type = o.getType()
	if type != 'Camera' and type != 'Lamp':
		#o.removeProperty('Name')
		scn.unlink(o)

frame = 1  # Start frame

# Create nmesh, object, and links
Xres = 50
Yres = 50
Xrange = 10
Yrange = 10
name = 'myNMesh'
mesh = create_nmesh(Xres, Yres, Xrange, Yrange, name)

ob = B.Object.New('Mesh', 'bolge')
ob.link(mesh)
scn.link(ob)

B.Window.EditMode(1)  # Unneccesary?
# Create shape key basis
ob.insertShapeKey()

#####################
## Animation data  ##
#####################

fps = 25        # frames per second
frame = 1       # start frame
samplerate = 5  # Number of frames per samples
numsamples = 30 # Total number of samples

############################
##  Wave Characteristics  ##
############################

n = 3 # Number of waves
amp = [float(1)/(i+3) for i in range(n)]
mean_angle = math.radians(30)
theta = [mean_angle + (random.random()-0.5)/1.0 for i in range(n)]
k = [2 - 0.5**(n-i) for i in range(n)]
g = 9.81
h = 10 # Sea depth
w = [math.sqrt(g*k[i]*math.tanh(k[i]*h)) for i in range(n)]

#####################################
##  Set animation and create keys  ##
#####################################

key = mesh.key  # Create a key
# if not key, bla bla
key.ipo = B.Ipo.New("Key", "minIPO") # An ipo-curve for the keys
ipo = key.ipo

# Create shape keys and set their ipo-curve
for i in range(numsamples):
	frame += samplerate
	time = float(frame-1)/fps 
	# Update nmesh
	update_waves(mesh, time, k, theta, w, amp)
	ob.insertShapeKey()
	curve = ipo.addCurve(ipo.curveConsts[-1])
	curve.append( (frame, 0.5) )
	curve.append( (frame-samplerate, 0) )
	curve.append( (frame+samplerate, 0) )
	curve.setInterpolation("Linear")
	curve.recalc()


ob.sel = 1
B.Window.RedrawAll()
12

Thank you very much for the script. I will play around with it this weekend.

13

Is there really no way to do this without going to the CVS version? I want to do something very similar on a commercial project, and we don’t like to use unstable software on a production, so we’re sticking to the release versions.

14

You do not need the cvs version for the script above.

15

Oh, I managed to get it working in my script the same way you did it! Thanks :slight_smile: