cityjson_global_appearance_size.py

# Returns the size of object in bytes
from sys import getsizeof

CityJSON = {
    "appearance": {
        "materials": [
            {
                "name": "door",
                "ambientIntensity": 0.2000,
                "diffuseColor": [0.9000, 0.1000, 0.7500],
                "emissiveColor": [0.9000, 0.1000, 0.7500],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.2,
                "transparency": 0.5,
                "isSmooth": False
            },
            {
                "name": "ground",
                "ambientIntensity": 0.2000,
                "diffuseColor": [0.9000, 0.1000, 0.7500],
                "emissiveColor": [0.9000, 0.1000, 0.7500],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.2,
                "transparency": 0.5,
                "isSmooth": False
            },
            {
                "name": "window",
                "ambientIntensity": 0.2000,
                "diffuseColor": [0.9000, 0.1000, 0.7500],
                "emissiveColor": [0.9000, 0.1000, 0.7500],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.2,
                "transparency": 0.5,
                "isSmooth": False
            },
            {
                "name": "roof",
                "ambientIntensity": 0.2000,
                "diffuseColor": [0.9000, 0.1000, 0.7500],
                "emissiveColor": [0.9000, 0.1000, 0.7500],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.2,
                "transparency": 0.5,
                "isSmooth": False
            },
            {
                "name": "wall",
                "ambientIntensity": 0.4000,
                "diffuseColor": [0.1000, 0.1000, 0.9000],
                "emissiveColor": [0.1000, 0.1000, 0.9000],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.0,
                "transparency": 0.5,
                "isSmooth": True
            },
            {
                "name": "dormer",
                "ambientIntensity": 0.2000,
                "diffuseColor": [0.9000, 0.1000, 0.7500],
                "emissiveColor": [0.9000, 0.1000, 0.7500],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.2,
                "transparency": 0.5,
                "isSmooth": False
            },
            {
                "name": "and_one_more_for_good_measure",
                "ambientIntensity": 0.2000,
                "diffuseColor": [0.9000, 0.1000, 0.7500],
                "emissiveColor": [0.9000, 0.1000, 0.7500],
                "specularColor": [0.9000, 0.1000, 0.7500],
                "shininess": 0.2,
                "transparency": 0.5,
                "isSmooth": False
            },
        ],
        "textures": [],
        "vertices-texture": [],
        "default-theme-texture": "myDefaultTheme1",
        "default-theme-material": "myDefaultTheme2"
    }
}
print(f"CityJSON object size (bytes) with materials: {getsizeof(CityJSON['appearance']) + getsizeof(CityJSON['appearance']['materials'])}")
# CityJSON object size (bytes) with materials: 344

# 3D BAG, different texture for each wall and roof surface, whole Netherlands.
# There are 9692978 buildings in the data set.
texture = {
    "type": "JPG",
    "image": "http://www.someurlthatisverylongandevenmorelongerandsubdomain.andsomeotherdomainthatisalsoverylong.org/filename.jpg",
    "wrapMode": "wrap",
    "textureType": "unknown",
    "borderColor": [0.0, 0.1, 0.2, 1.0]
}
nr_wall_roof_surfaces = 303495171
CityJSON["appearance"]["textures"] = [texture for srf in range(nr_wall_roof_surfaces)]
print(f"CityJSON object size (bytes) with materials, plus different texture for each surface, Netherlands: {getsizeof(CityJSON['appearance']) + getsizeof(CityJSON['appearance']['materials']) + getsizeof(CityJSON['appearance']['textures'])}")
# CityJSON object size (bytes) with materials, plus different texture for each surface, Netherlands: 2481602248
# That's about 2.48Gb

# We add an uv-coordinate for each vertex for mapping the textures.
# This is excessive, because in reality, we probably won't need a uv-coordinate for each vertex.
nr_vertices = 2033913590
uv_coord = [0.0, 0.0]
CityJSON["appearance"]["vertices-texture"] = [uv_coord for vtx in range(nr_vertices)]
print(f"CityJSON object size (bytes) with materials, plus different texture for each surface, plus uv-coordinate for each vertex, Netherlands: {getsizeof(CityJSON['appearance']) + getsizeof(CityJSON['appearance']['materials']) + getsizeof(CityJSON['appearance']['textures']) + + getsizeof(CityJSON['appearance']['vertices-texture'])}")
# CityJSON object size (bytes) with materials, plus different texture for each surface, plus uv-coordinate for each vertex, Netherlands: 18818610480
# That's about 18.81Gb