autoAlignView.py

bl_info = {
    "name": "Auto Align View",
    "author": "Eero Mutka",
    "version": (1, 0),
    "blender": (2, 75, 0),
    "location": "View3D",
    "description": "Aligns the view to the closest axis",
    "warning": "",
    "wiki_url": "",
    "category": "3D View",
    }

import bpy
from mathutils import Vector

def main(context):
    v3d = context.space_data
    rv3d = v3d.region_3d

    ForwardVector = rv3d.view_rotation * Vector((0.0, 0.0, -1.0))

    ViewDir = "FRONT"
    ClosestDot = ForwardVector.dot(Vector((0.0, 1.0, 0.0)))

    Dot = ForwardVector.dot(Vector((0.0, -1.0, 0.0)))
    if Dot > ClosestDot:
        ViewDir = "BACK"
        ClosestDot = Dot

    Dot = ForwardVector.dot(Vector((-1.0, 0.0, 0.0)))
    if Dot > ClosestDot:
        ViewDir = "RIGHT"
        ClosestDot = Dot

    Dot = ForwardVector.dot(Vector((1.0, 0.0, 0.0)))
    if Dot > ClosestDot:
        ViewDir = "LEFT"
        ClosestDot = Dot

    Dot = ForwardVector.dot(Vector((0.0, 0.0, -1.0)))
    if Dot > ClosestDot:
        ViewDir = "TOP"
        ClosestDot = Dot

    Dot = ForwardVector.dot(Vector((0.0, 0.0, 1.0)))
    if Dot > ClosestDot:
        ViewDir = "BOTTOM"
        ClosestDot = Dot

    bpy.ops.view3d.viewnumpad(type = ViewDir)


class AutoAlignView(bpy.types.Operator):
    """Tooltip"""
    bl_idname = "view3d.auto_align_view"
    bl_label = "Auto Align View"

    def execute(self, context):
        main(context)
        return {'FINISHED'}


def register():
    bpy.utils.register_class(AutoAlignView)


def unregister():
    bpy.utils.unregister_class(AutoAlignView)


if __name__ == "__main__":
    register()