chandrasekhar reddy guda wrote: Matthias Buehler i am also having the same problem, normals problems getting when importing drawing file, please share a code of .net |
Hello Chandra Sekhar Reddy Guda,
There is no need to write .net code, in fact CityEngine does not use .net at all.
Instead you can use CityEngine CGA modelling language to manipulate the imported shapes from a drawing file.
The cga rule snipped above provided by Matthias Buehler can be used to reverse any down facing normals.
Further information can be found in the CityEngine CGA Help:
reverseNormals Operation
As a second option, you can use the CityEngine python scripting interface.
This python script corrects the shapes normals after import:
# checks if the shape point order is clockwise
# note: applies to horizontal plane (x: east, y: up, z: south)
def clockwise(shape):
shapeVertices = ce.getVertices(shape)
sum = 0
for i in xrange(0,len(shapeVertices),3):
x1 = shapeVertices
z1 = shapeVertices[i+2]
x2 = shapeVertices[(i+3)%len(shapeVertices)]
z2 = shapeVertices[(i+5)%len(shapeVertices)]
sum += (x2-x1)*(z2+z1)
return sum < 0
if __name__ == '__main__':
selectedShapes = ce.selection()
for shape in selectedShapes:
if ce.isShape(shape):
# ensure counter-clockwise order of input shapes (normal up)
if clockwise(shape):
ce.reverseNormals(shape)
Further information can be found in the CityEngine Python Help:
Python Scripting Interface Reference
