hey

I try to export the vertices, normals and uv. I do not know whats going wrong with my export script. Sometimes it works well but now i get the error:
KeyError: bpy_prop_collection[key]: key "Cylinder" not found
?
how can i fix the problem?

This is my simple code


the error is here: me = bpy.data.meshes[bpy.context.active_object.name]

Code:

import bpy def writeString(file, string):    file.write(bytes(string, 'UTF-8'))     filepath = 'D:\JackyFlasche.h' file = open(filepath, "wb") if bpy.app.version[0] < 2 or bpy.app.version[1] < 62:         raise Exception("only for Blender 2.62 and above")     bpy.ops.object.mode_set(mode='OBJECT') # Can't access cprdinate date in edit mode currently me = bpy.data.meshes[bpy.context.active_object.name] count = 0 for f in me.polygons:    for i in f.loop_indices:       for j,ul in enumerate(me.uv_layers):          count = count + 1              writeString(file, '\n#define kObjectNumberOfVertices %d\n' % ( count )) writeString(file, '\n') writeString(file, '@implmentation %s\n' % ( bpy.context.active_object.name )) writeString(file, '\n') writeString(file, '-(id)init{\n') writeString(file, '\tstatic TexturedVertexData3D ObjectVertexData[] = {\n') for f in me.polygons:    for i in f.loop_indices:       l = me.loops[i]       vert = me.vertices[l.vertex_index]       # print(v.co.x, v.co.y, v.co.z)       for j,ul in enumerate(me.uv_layers):          writeString(file, '\t\t{/*v:*/{%F, %F, %F}, ' % (vert.co.x, vert.co.y, vert.co.z) )          writeString(file, '/*n:*/{%F, %F, %F}, ' % (vert.normal.x, vert.normal.y, vert.normal.z))          writeString(file, '/*t:*/{%F, %F}' % (ul.data[l.index].uv.x, ul.data[l.index].uv.y ) )          writeString(file, '},\n') writeString(file, '\t};\n') writeString(file, '};\n')     file.flush() file.close()

Okay, here comes your code review

this is a really bad idea:

Code:

me = bpy.data.meshes[bpy.context.active_object.name]

1. The script makes the assumption, that there's always a Mesh with a certain name
2. It looks for a Mesh with the same name as the active object (which is a completely different ID datablock type)
3. The active object is the object the user (de-)selected last, so it depends on the current context

if you want to export only the active object of type mesh, do:

Code:

ob = bpy.context.object if ob is None or ob.type == 'MESH':     print("Need an active Mesh object!") else:     me = ob.data

Or if you want to export a mesh object with a certain name:

Code:

ob = bpy.data.objects.get("Cylinder") if ob is not None and ob.type == 'MESH':     print("Object %s - Mesh %s" % (ob.name, ob.data.name))

You can do simpler:

Code:

if bpy.app.version[0] < 2 or bpy.app.version[1] < 62:         raise Exception("only for Blender 2.62 and above") if bpy.app.version < (2,62): ...

Not sure what you count here:

Code:

count = 0 for f in me.polygons:    for i in f.loop_indices:       for j,ul in enumerate(me.uv_layers):          count = count + 1

It should be fine to use either of these:

Code:

len(me.loops) len(me.uv_layers.active.data)

No need to enumerate if you don't use "j" anywhere...

Code:

for j,ul in enumerate(me.uv_layers):  ... # rather: for ul in me.uv_layers: ...

It's a little easier to use slide syntax to avoid ...x, ...y, ...z:

Code:

writeString(file, '\t\t{/*v:*/{%F, %F, %F}, ' % (vert.co.x, vert.co.y, vert.co.z) )          writeString(file, '/*n:*/{%F, %F, %F}, ' % (vert.normal.x, vert.normal.y, vert.normal.z))          writeString(file, '/*t:*/{%F, %F}' % (ul.data[l.index].uv.x, ul.data[l.index].uv.y ) )          writeString(file, '\t\t{/*v:*/{%F, %F, %F}, ' % vert.co[:])          writeString(file, '/*n:*/{%F, %F, %F}, ' % vert.normal[:])          writeString(file, '/*t:*/{%F, %F}' % ul.data[l.index].uv[:]) # Special case: Vector objects define __repr__() and __str__(), printing their components #print(v.co)

I bet python flushes automatically if you close file:

Code:

file.flush() # superfluous file.close()

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