AnyImage/tools/nodes/groups/image_depth_balloon.py

"""Build O Image Depth Balloon."""
import bpy
from mathutils import Matrix
from anyimage.operators.cutout_tool.shape import CUTOUT_Z_TO_X, NORMAL_SCALE_ATTRIBUTE_NAME
from ..common.nodes import (
    interface_socket, group_input, math_node, float_input, bool_input, vector_input,
    menu_switch, read_float_attribute, store_float_attribute, prepare_node_group,
)
from ..common.smoothing import expand_smooth
from ..common.reference_plane import reference_plane_depth
from ..common.cutout import _extrude_layers, _island_cleanup, _position_field, _profile_field, _remove_zero_thickness, _set_layer_z, _shade_output


NODE_GROUP_NAME = "O Image Depth Balloon"


def _set_geometry_z(group, geometry, z_value):
    nodes = group.nodes
    links = group.links
    position = nodes.new("GeometryNodeInputPosition")
    separate = nodes.new("ShaderNodeSeparateXYZ")
    links.new(position.outputs["Position"], separate.inputs["Vector"])
    combine = nodes.new("ShaderNodeCombineXYZ")
    links.new(separate.outputs["X"], combine.inputs["X"])
    links.new(separate.outputs["Y"], combine.inputs["Y"])
    links.new(z_value, combine.inputs["Z"])
    set_position = nodes.new("GeometryNodeSetPosition")
    links.new(geometry, set_position.inputs["Geometry"])
    links.new(combine.outputs["Vector"], set_position.inputs["Position"])
    return set_position.outputs["Geometry"]


def _build_depth_balloon(
    group,
    geometry,
    thickness,
    depth_scale,
    double_sided,
    uniform_scale,
    depth_direction,
    depth_image,
    depth_reference,
):
    nodes = group.nodes
    links = group.links
    profile, profile_factor = _profile_field(group, geometry)
    camera_position = _position_field(group, depth_image)
    separate_camera = nodes.new("ShaderNodeSeparateXYZ")
    links.new(camera_position, separate_camera.inputs["Vector"])
    metric_depth = math_node(nodes, "MULTIPLY")
    links.new(separate_camera.outputs["Z"], metric_depth.inputs[0])
    links.new(uniform_scale, metric_depth.inputs[1])
    plane_depth = reference_plane_depth(
        group,
        depth_direction,
        depth_reference,
    )
    corrected_depth = math_node(nodes, "SUBTRACT")
    links.new(plane_depth, corrected_depth.inputs[0])
    links.new(metric_depth.outputs[0], corrected_depth.inputs[1])
    nonnegative_depth = math_node(nodes, "MAXIMUM")
    nonnegative_depth.inputs[1].default_value = 0.0
    links.new(corrected_depth.outputs[0], nonnegative_depth.inputs[0])
    scaled_depth = math_node(nodes, "MULTIPLY")
    links.new(nonnegative_depth.outputs[0], scaled_depth.inputs[0])
    links.new(depth_scale, scaled_depth.inputs[1])
    front_depth = scaled_depth.outputs[0]
    base_front = math_node(nodes, "MULTIPLY")
    links.new(profile, base_front.inputs[0])
    links.new(thickness, base_front.inputs[1])
    base_back = math_node(nodes, "MULTIPLY")
    links.new(profile, base_back.inputs[0])
    links.new(thickness, base_back.inputs[1])
    negate_back = math_node(nodes, "MULTIPLY")
    negate_back.inputs[1].default_value = -1.0
    links.new(base_back.outputs[0], negate_back.inputs[0])
    front_mix = nodes.new("ShaderNodeMix")
    front_mix.data_type = "FLOAT"
    front_mix.clamp_factor = True
    links.new(profile_factor, front_mix.inputs["Factor"])
    links.new(base_front.outputs[0], front_mix.inputs["A"])
    links.new(front_depth, front_mix.inputs["B"])
    mirrored_front = math_node(nodes, "MULTIPLY")
    mirrored_front.inputs[1].default_value = -1.0
    links.new(front_mix.outputs["Result"], mirrored_front.inputs[0])
    back_choice = nodes.new("GeometryNodeSwitch")
    back_choice.input_type = "FLOAT"
    links.new(double_sided, back_choice.inputs["Switch"])
    links.new(negate_back.outputs[0], back_choice.inputs["False"])
    links.new(mirrored_front.outputs[0], back_choice.inputs["True"])
    extrude = _extrude_layers(group, geometry)
    shaped = _set_layer_z(
        group,
        geometry,
        extrude,
        front_mix.outputs["Result"],
        back_choice.outputs["Output"],
    )
    front_only = _set_geometry_z(
        group, geometry, front_mix.outputs["Result"]
    )
    return _remove_zero_thickness(group, front_only, shaped, thickness)


def build_image_depth_balloon_group():
    name = NODE_GROUP_NAME
    existing = bpy.data.node_groups.get(name)
    if existing is not None:
        return existing
    group = bpy.data.node_groups.new(name, 'GeometryNodeTree')
    group.is_modifier, group.use_fake_user = (True, True)
    group.color_tag = 'GEOMETRY'
    group['anyimage_asset_revision'] = 11
    interface_socket(group, 'Geometry', 'INPUT', 'NodeSocketGeometry')
    float_input(group, 'Thickness', 1.0).description = 'Balloon profile multiplier; zero returns the sheet'
    float_input(group, 'Depth Scale', 1.0)
    bool_input(group, 'Double Sided', True)
    iterations = interface_socket(group, 'Smooth', 'INPUT', 'NodeSocketInt')
    iterations.default_value = 0
    iterations.min_value, iterations.max_value = (0, 20)
    options = group.interface.new_panel(name='Options', default_closed=True)
    float_input(group, 'Cleanup Threshold', 0.0, parent=options)
    float_input(group, 'Reference Depth', 1.0, subtype='DISTANCE', parent=options)
    float_input(group, 'Smooth Weight', 1.0, maximum=1, subtype='FACTOR', parent=options)
    vector_input(group, 'Depth Direction', (0, 0, 1), subtype='DIRECTION', parent=options)
    data = group.interface.new_panel(name='Data', default_closed=True)
    interface_socket(group, 'Inward Axis', 'INPUT', 'NodeSocketMenu', data).hide_in_modifier = True
    float_input(group, 'Uniform Scale', 1.0, parent=data).hide_in_modifier = True
    interface_socket(group, 'Depth Image', 'INPUT', 'NodeSocketImage', data).hide_in_modifier = True
    interface_socket(group, 'Geometry', 'OUTPUT', 'NodeSocketGeometry')
    controls = group_input(group.nodes, set())
    geometry = _build_depth_balloon(group, controls.outputs['Geometry'], controls.outputs['Thickness'], controls.outputs['Depth Scale'], controls.outputs['Double Sided'], controls.outputs['Uniform Scale'], controls.outputs['Depth Direction'], controls.outputs['Depth Image'], controls.outputs['Reference Depth'])
    planar_inputs = [link.to_socket for link in group.links if link.from_node.bl_idname == 'NodeGroupInput' and link.from_socket.name == 'Geometry']
    base = group_input(group.nodes, {'Geometry', 'Cleanup Threshold'})
    area = math_node(group.nodes, 'MULTIPLY')
    area.inputs[1].default_value = 0.01
    group.links.new(base.outputs['Cleanup Threshold'], area.inputs[0])
    cleaned = _island_cleanup(group, base.outputs['Geometry'], area.outputs[0])
    for target in planar_inputs:
        group.links.new(cleaned, target)
    geometry = expand_smooth(group, geometry, iterations_name='Smooth', weight_name='Smooth Weight')
    profile = read_float_attribute(group, 'o_balloon')
    scale = profile
    geometry = store_float_attribute(group, geometry, NORMAL_SCALE_ATTRIBUTE_NAME, scale)
    orient = group.nodes.new('GeometryNodeTransform')
    orient.inputs['Rotation'].default_value = Matrix(CUTOUT_Z_TO_X).to_euler()
    group.links.new(geometry, orient.inputs['Geometry'])
    axis = menu_switch(group, 'Inward Axis', ('-Z', '+X'), 'GEOMETRY')
    group.links.new(geometry, axis.inputs['-Z'])
    group.links.new(orient.outputs[0], axis.inputs['+X'])
    _shade_output(group, axis.outputs[0])
    prepare_node_group(group)
    for item in group.interface.items_tree:
        if item.item_type != 'SOCKET' or item.in_out != 'INPUT':
            continue
        if item.name == 'Mode':
            item.default_value = 'Balloon'
        elif item.name == 'Inward Axis':
            item.default_value = '-Z'
        elif item.name == 'Uniform Thickness':
            item.name = 'Thickness'
    return group