Source code for openalea.plantconvert.material

import openalea.plantgl.all as pgl




def to_plantgl(material_data):
    """Create a plantgl object to represent a material from the input material_data.

    :param material_data: dictionary that contains exactly :
        An `Id`
        4 colors in RGBA : emission, ambient, diffuse and specular.
        `shininess` value.
    :type material_data: dict
    :return: plantgl.Material object. Note that some information might be lost.
        For example, the alpha value in .opf is defined for each color (emission, etc. )
        while in plantgl there is only a global alpha value : transparency = 1 - alpha
    :rtype: plantgl.Material
    """
    # return a plantgl object : material that corresponds to the input dictionary
    if set(material_data.keys()) != {
        "emission",
        "ambient",
        "diffuse",
        "specular",
        "shininess",
    }:
        raise KeyError
    len(material_data)
    # compute the transparency
    # initialize a plantgl material object
    shininess = material_data["shininess"] / 128.0

    # transparency = min([1.-material_data['emission'][-1], 1.-material_data['ambient'][-1] ,
    # 1.-material_data['specular'][-1]]) # revert alpha to build transparency
    transparency = 0
    emission = pgl.Color3(*[int(255 * material_data["emission"][i]) for i in range(3)])
    ambient = pgl.Color3(*[int(255 * material_data["ambient"][i]) for i in range(3)])
    specular = pgl.Color3(*[int(255 * material_data["specular"][i]) for i in range(3)])
    diffuse_over_ambient = [
        material_data["diffuse"][i] / material_data["ambient"][i]
        for i in range(3)
        if material_data["ambient"][i] != 0.0
    ]
    try:
        diffuse = sum(diffuse_over_ambient) / len(diffuse_over_ambient)
    except ZeroDivisionError:
        diffuse = 0.0
    return pgl.Material(
        ambient=ambient,
        diffuse=diffuse,
        specular=specular,
        emission=emission,
        shininess=shininess,
        transparency=transparency,
    )





def to_gltf(material_data):
    """Create the material information accepted by GLTF, not implemented yet."""
    raise NotImplementedError