armorpaint/paint/sources/material_nodes/camera_data_node.ts

function camera_data_node_init() {
    array_push(nodes_material_input, camera_data_node_def);
    map_set(parser_material_node_vectors, "CAMERA", camera_data_node_vector);
	map_set(parser_material_node_values, "CAMERA", camera_data_node_value);
}

function camera_data_node_vector(node: ui_node_t, socket: ui_node_socket_t): string {
    parser_material_kong.frag_vvec_cam = true;
	return "vvec_cam";
}

function camera_data_node_value(node: ui_node_t, socket: ui_node_socket_t): string {
    if (socket == node.outputs[1]) { // View Z Depth
        node_shader_add_constant(parser_material_kong, "camera_proj: float2", "_camera_plane_proj");
        parser_material_kong.frag_wvpposition = true;
        return "(constants.camera_proj.y / ((input.wvpposition.z / input.wvpposition.w) - constants.camera_proj.x))";
    }
    else { // View Distance
        node_shader_add_constant(parser_material_kong, "eye: float3", "_camera_pos");
        parser_material_kong.frag_wposition = true;
        return "distance(constants.eye, input.wposition)";
    }
}

let camera_data_node_def: ui_node_t = {
    id: 0,
    name: _tr("Camera Data"),
    type: "CAMERA",
    x: 0,
    y: 0,
    color: 0xffb34f5a,
    inputs: [],
    outputs: [
        {
            id: 0,
            node_id: 0,
            name: _tr("View Vector"),
            type: "VECTOR",
            color: 0xff6363c7,
            default_value: f32_array_create_xyz(0.0, 0.0, 0.0),
            min: 0.0,
            max: 1.0,
            precision: 100,
            display: 0
        },
        {
            id: 0,
            node_id: 0,
            name: _tr("View Z Depth"),
            type: "VALUE",
            color: 0xffa1a1a1,
            default_value: f32_array_create_x(0.0),
            min: 0.0,
            max: 1.0,
            precision: 100,
            display: 0
        },
        {
            id: 0,
            node_id: 0,
            name: _tr("View Distance"),
            type: "VALUE",
            color: 0xffa1a1a1,
            default_value: f32_array_create_x(0.0),
            min: 0.0,
            max: 1.0,
            precision: 100,
            display: 0
        }
    ],
    buttons: [],
    width: 0,
    flags: 0
};