io_scene_gltf2/blender/imp/gltf2_blender_camera.py

   1 # SPDX-FileCopyrightText: 2018-2021 The glTF-Blender-IO authors
   2 #
   3 # SPDX-License-Identifier: Apache-2.0
   4
   5 import bpy
   6 from math import tan
   7 from ..com.gltf2_blender_extras import set_extras
   8 from ...io.imp.gltf2_io_user_extensions import import_user_extensions
   9
  10
  11 class BlenderCamera():
  12     """Blender Camera."""
  13     def __new__(cls, *args, **kwargs):
  14         raise RuntimeError("%s should not be instantiated" % cls)
  15
  16     @staticmethod
  17     def create(gltf, vnode, camera_id):
  18         """Camera creation."""
  19         pycamera = gltf.data.cameras[camera_id]
  20
  21         import_user_extensions('gather_import_camera_before_hook', gltf, vnode, pycamera)
  22
  23         if not pycamera.name:
  24             pycamera.name = "Camera"
  25
  26         cam = bpy.data.cameras.new(pycamera.name)
  27         set_extras(cam, pycamera.extras)
  28
  29         # Blender create a perspective camera by default
  30         if pycamera.type == "orthographic":
  31             cam.type = "ORTHO"
  32
  33             cam.ortho_scale = max(pycamera.orthographic.xmag, pycamera.orthographic.ymag) * 2
  34
  35             cam.clip_start = pycamera.orthographic.znear
  36             cam.clip_end = pycamera.orthographic.zfar
  37
  38             # Store multiple channel data, as we will need all channels to convert to blender data when animated by KHR_animation_pointer
  39             if gltf.data.extensions_used is not None and "KHR_animation_pointer" in gltf.data.extensions_used:
  40                 if len(pycamera.animations) > 0:
  41                     for anim_idx in pycamera.animations.keys():
  42                         for channel_idx in pycamera.animations[anim_idx]:
  43                             channel = gltf.data.animations[anim_idx].channels[channel_idx]
  44                             pointer_tab = channel.target.extensions["KHR_animation_pointer"]["pointer"].split("/")
  45                             if len(pointer_tab) == 5 and pointer_tab[1] == "cameras" and \
  46                                     pointer_tab[3] == "orthographic" and \
  47                                     pointer_tab[4] in ["xmag", "ymag"]:
  48                                 # Store multiple channel data, as we will need all channels to convert to blender data when animated
  49                                 if not hasattr(pycamera, "multiple_channels_mag"):
  50                                     pycamera.multiple_channels_mag = {}
  51                                 pycamera.multiple_channels_mag[pointer_tab[4]] = (anim_idx, channel_idx)
  52
  53         else:
  54             cam.angle_y = pycamera.perspective.yfov
  55             cam.lens_unit = "FOV"
  56             cam.sensor_fit = "VERTICAL"
  57
  58             # TODO: fov/aspect ratio
  59
  60             cam.clip_start = pycamera.perspective.znear
  61             if pycamera.perspective.zfar is not None:
  62                 cam.clip_end = pycamera.perspective.zfar
  63             else:
  64                 # Infinite projection
  65                 cam.clip_end = 1e12  # some big number
  66
  67         pycamera.blender_object_data = cam # Needed in case of KHR_animation_pointer
  68
  69         return cam
  70
  71
  72     @staticmethod
  73     def calc_lens_from_fov(gltf, input_value, sensor):
  74         return (sensor / 2.0) / tan(input_value * 0.5)