Script to calculate total area of faces in layer

Scripting
1

I often have to calculate the total area of surface, polysurface, extrusion of each layer. Can anyone help me create a python script that calculates the total area of the faces in the layer and writes it out as text. thank

2

sure, post here what you created so far

3

Here’s a simple grasshopper option. You can take it a lot further with additional plugins (auto reference all layers, export to excel, whatever)

You can could add a print text without a plugin and run via Grasshopper Player as well.

image
image1639×566 130 KB

re_area-script.gh (10.9 KB)
re_area script.3dm (150.1 KB)

1 Like
4

run GrasshopperPlayer in the Command line and select this script. The idea being that you create a button with a reference to the script.

image
image1751×570 139 KB

re_area-script-Gh Player.gh (14.2 KB)

1 Like
5

I’m a beginner in python scripting. this is the script i’m trying and don’t know where the error is coming from

import rhinoscriptsyntax as rs
# -*- coding: utf-8 -*
import scriptcontext as sc
import Rhino

def SelectObjectTypes(objs):
    for obj in objs:
        otype=rs.ObjectType(obj)
        if otype==8 or otype==16:
            rs.SelectObject(obj)

def Layer_area():
    pt = rs.GetPoint("Get point")
    rs.EnableRedraw(False)
    layers=rs.LayerNames()
    text = 0
    for layer in layers:
        if rs.IsLayerSelectable(layer):
            rs.UnselectAllObjects()
            objs=rs.ObjectsByLayer(layer, False)
            ID = SelectObjectTypes(objs)
            if rs.SelectedObjects():
                brep=sc.doc.Objects.Find(ID).Geometry
                S = 0
                for i in range(brep.Faces.Count):
                    area=Rhino.Geometry.AreaMassProperties.Compute(brep.Faces[i]).Area
                    S +=area
            layer_name=layer.replace("::","_")
            e_file_name = '{}{}{\n}'.format(layer_name,S)
            text += e_file_name
            text_id = rs.AddText(text,pt,100,font="Arial",justification=131072+2)
    rs.EnableRedraw(True)

Layer_area()
1 Like
6

1 great solution. but I don’t use fixed layers often so this idea doesn’t seem to work very well for me. thanks for your support

1 Like
7

Here

def SelectObjectTypes(objs):
    for obj in objs:
        otype=rs.ObjectType(obj)
        if otype==8 or otype==16:
            rs.SelectObject(obj)

you don’t return any value from that called function, the function selects an object only, so nothing gets assigned to ID, you probably need to:

def SelectObjectTypes(objs):
    for obj in objs:
        otype=rs.ObjectType(obj)
        if otype==8 or otype==16:
            return obj

and then after that check if an ID has been returned

9

I have edited a bit in the calculation of the area and the place you said. but the script is still not correct somewhere

import rhinoscriptsyntax as rs
# -*- coding: utf-8 -*
import scriptcontext as sc
import Rhino

def SelectObjectTypes(objs):
    for obj in objs:
        otype=rs.ObjectType(obj)
        if otype==8 or otype==16:
            return obj
def objects_area(IDS):
    S_all=0
    for ID in IDS:
        brep=sc.doc.Objects.Find(ID).Geometry
        S = 0
        for i in range(brep.Faces.Count):
            area=Rhino.Geometry.AreaMassProperties.Compute(brep.Faces[i]).Area
            S +=area
        S_all += S
    return S_all

def Layer_area():
    pt = rs.GetPoint("Get point")
    rs.EnableRedraw(False)
    layers=rs.LayerNames()
    text = 0
    for layer in layers:
        if rs.IsLayerSelectable(layer):
            rs.UnselectAllObjects()
            objs=rs.ObjectsByLayer(layer, False)
            IDS = SelectObjectTypes(objs)
            if rs.SelectedObjects():
                total_area = objects_area(IDS)
            layer_name=layer.replace("::","_")
            e_file_name = '{}{}{\n}'.format(layer_name,total_area)
            text += e_file_name
            text_id = rs.AddText(text,pt,100,font="Arial",justification=131072+2)
    rs.EnableRedraw(True)

Layer_area()
10 
def SelectObjectTypes(objs):
    ids = []    
    for obj in objs:
            otype=rs.ObjectType(obj)
            if otype==8 or otype==16:
                ids.append(obj)
    return ids

I think that this is what you want then…