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projector.py
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projector.py
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import logging
import math
import os
from enum import Enum
import bpy
from bpy.types import Operator
from .helper import (ADDON_ID, auto_offset,
get_projectors, get_projector, random_color)
logging.basicConfig(
format='[Projectors Addon]: %(name)s - %(levelname)s - %(message)s')
log = logging.getLogger(name=__file__)
class Textures(Enum):
CHECKER = 'checker_texture'
COLOR_GRID = 'color_grid_texture'
CUSTOM_TEXTURE = 'custom_texture'
RESOLUTIONS = [
# 16:10 aspect ratio
('1280x800', 'WXGA (1280x800) 16:10', '', 1),
('1440x900', 'WXGA+ (1440x900) 16:10', '', 2),
('1920x1200', 'WUXGA (1920x1200) 16:10', '', 3),
# 16:9 aspect ratio
('1280x720', '720p (1280x720) 16:9', '', 4),
('1920x1080', '1080p (1920x1080) 16:9', '', 5),
('3840x2160', '4K Ultra HD (3840x2160) 16:9', '', 6),
# 4:3 aspect ratio
('800x600', 'SVGA (800x600) 4:3', '', 7),
('1024x768', 'XGA (1024x768) 4:3', '', 8),
('1400x1050', 'SXGA+ (1400x1050) 4:3', '', 9),
('1600x1200', 'UXGA (1600x1200) 4:3', '', 10),
# 17:9 aspect ratio
('4096x2160', 'Native 4K (4096x2160) 17:9', '', 11),
# 1:1 aspect ratio
('1000x1000', 'Square (1000x1000) 1:1', '', 12)
]
PROJECTED_OUTPUTS = [(Textures.CHECKER.value, 'Checker', '', 1),
(Textures.COLOR_GRID.value, 'Color Grid', '', 2),
(Textures.CUSTOM_TEXTURE.value, 'Custom Texture', '', 3)]
class PROJECTOR_OT_change_color_randomly(Operator):
""" Randomly change the color of the projected checker texture."""
bl_idname = 'projector.change_color'
bl_label = 'Change color of projection checker texture'
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
return len(get_projectors(context, only_selected=True)) == 1
def execute(self, context):
projectors = get_projectors(context, only_selected=True)
new_color = random_color(alpha=True)
for projector in projectors:
projector.proj_settings['projected_color'] = new_color[:-1]
update_checker_color(projector.proj_settings, context)
return {'FINISHED'}
def create_projector_textures():
""" This function checks if the needed images exist and if not creates them. """
name_template = '_proj.tex.{}'
for res in RESOLUTIONS:
img_name = name_template.format(res[0])
w, h = res[0].split('x')
if not bpy.data.images.get(img_name):
log.debug(f'Create projection texture: {res}')
bpy.ops.image.new(name=img_name,
width=int(w),
height=int(h),
color=(0.0, 0.0, 0.0, 1.0),
alpha=True,
generated_type='COLOR_GRID',
float=False)
bpy.data.images[img_name].use_fake_user = True
def add_projector_node_tree_to_spot(spot):
"""
This function turns a spot light into a projector.
This is achieved through a texture on the spot light and some basic math.
"""
spot.data.use_nodes = True
root_tree = spot.data.node_tree
root_tree.nodes.clear()
node_group = bpy.data.node_groups.new('_Projector', 'ShaderNodeTree')
# Create output sockets for the node group.
output = node_group.outputs
output.new('NodeSocketVector', 'texture vector')
output.new('NodeSocketColor', 'color')
# # Inside Group Node #
# #####################
# Hold important nodes inside a group node.
group = spot.data.node_tree.nodes.new('ShaderNodeGroup')
group.node_tree = node_group
group.label = "!! Don't touch !!"
nodes = group.node_tree.nodes
tree = group.node_tree
auto_pos = auto_offset()
tex = nodes.new('ShaderNodeTexCoord')
tex.location = auto_pos(200)
map_1 = nodes.new('ShaderNodeMapping')
map_1.vector_type = 'TEXTURE'
# Flip the image horizontally and vertically to display it the intended way.
if bpy.app.version < (2, 81):
map_1.scale[0] = -1
map_1.scale[1] = -1
else:
map_1.inputs[3].default_value[0] = -1
map_1.inputs[3].default_value[1] = -1
map_1.location = auto_pos(200)
sep = nodes.new('ShaderNodeSeparateXYZ')
sep.location = auto_pos(350)
div_1 = nodes.new('ShaderNodeMath')
div_1.operation = 'DIVIDE'
div_1.name = ADDON_ID + 'div_01'
div_1.location = auto_pos(200)
div_2 = nodes.new('ShaderNodeMath')
div_2.operation = 'DIVIDE'
div_2.name = ADDON_ID + 'div_02'
div_2.location = auto_pos(y=-200)
com = nodes.new('ShaderNodeCombineXYZ')
com.inputs['Z'].default_value = 1.0
com.location = auto_pos(200)
map_2 = nodes.new('ShaderNodeMapping')
map_2.location = auto_pos(200)
map_2.vector_type = 'TEXTURE'
add = nodes.new('ShaderNodeMixRGB')
add.blend_type = 'ADD'
add.inputs[0].default_value = 1
add.location = auto_pos(350)
# Texture
# a) Image
img = nodes.new('ShaderNodeTexImage')
img.extension = 'CLIP'
img.location = auto_pos(200)
# b) Generated checker texture.
checker_tex = nodes.new('ShaderNodeTexChecker')
# checker_tex.inputs['Color2'].default_value = random_color(alpha=True)
checker_tex.inputs[3].default_value = 8
checker_tex.inputs[1].default_value = (1, 1, 1, 1)
checker_tex.location = auto_pos(y=-300)
mix_rgb = nodes.new('ShaderNodeMixRGB')
mix_rgb.name = 'Mix.001'
mix_rgb.inputs[1].default_value = (0, 0, 0, 0)
mix_rgb.location = auto_pos(200, y=-300)
group_output_node = node_group.nodes.new('NodeGroupOutput')
group_output_node.location = auto_pos(200)
# # Root Nodes #
# ##############
auto_pos_root = auto_offset()
# Image Texture
user_texture = root_tree.nodes.new('ShaderNodeTexImage')
user_texture.extension = 'CLIP'
user_texture.label = 'Add your Image Texture or Movie here'
user_texture.location = auto_pos_root(200, y=200)
# Emission
emission = root_tree.nodes.new('ShaderNodeEmission')
emission.inputs['Strength'].default_value = 1
emission.location = auto_pos_root(300)
# Material Output
output = root_tree.nodes.new('ShaderNodeOutputLight')
output.location = auto_pos_root(200)
# # LINK NODES #
# ##############
# Link inside group node
tree.links.new(tex.outputs['Normal'], map_1.inputs['Vector'])
tree.links.new(map_1.outputs['Vector'], sep.inputs['Vector'])
tree.links.new(sep.outputs[0], div_1.inputs[0]) # X -> value0
tree.links.new(sep.outputs[2], div_1.inputs[1]) # Z -> value1
tree.links.new(sep.outputs[1], div_2.inputs[0]) # Y -> value0
tree.links.new(sep.outputs[2], div_2.inputs[1]) # Z -> value1
tree.links.new(div_1.outputs[0], com.inputs[0])
tree.links.new(div_2.outputs[0], com.inputs[1])
tree.links.new(com.outputs['Vector'], map_2.inputs['Vector'])
# Textures
# a) generated texture
tree.links.new(map_2.outputs['Vector'], add.inputs['Color1'])
tree.links.new(add.outputs['Color'], img.inputs['Vector'])
tree.links.new(add.outputs['Color'], group_output_node.inputs[0])
# b) checker texture
tree.links.new(add.outputs['Color'], checker_tex.inputs['Vector'])
tree.links.new(img.outputs['Alpha'], mix_rgb.inputs[0])
tree.links.new(checker_tex.outputs['Color'], mix_rgb.inputs[2])
# Link in root
root_tree.links.new(group.outputs[0], user_texture.inputs['Vector'])
root_tree.links.new(group.outputs[1], emission.inputs['Color'])
root_tree.links.new(emission.outputs['Emission'], output.inputs['Surface'])
# Pixel Grid Setup
pixel_grid_group = create_pixel_grid_node_group()
pixel_grid_node = spot.data.node_tree.nodes.new('ShaderNodeGroup')
pixel_grid_node.node_tree = pixel_grid_group
pixel_grid_node.label = "Pixel Grid"
pixel_grid_node.name = 'pixel_grid'
loc = root_tree.nodes['Emission'].location
pixel_grid_node.location = (loc[0], loc[1] - 150)
root_tree.links.new(group.outputs[0], pixel_grid_node.inputs[1])
root_tree.links.new(emission.outputs[0], pixel_grid_node.inputs[0])
def get_resolution(proj_settings, context):
""" Find out what resolution is currently used and return it.
Resolution from the dropdown or the resolution from the custom texture.
"""
if proj_settings.use_custom_texture_res and proj_settings.projected_texture == Textures.CUSTOM_TEXTURE.value:
projector = get_projector(context)
root_tree = projector.children[0].data.node_tree
image = root_tree.nodes['Image Texture'].image
if image:
w = image.size[0]
h = image.size[1]
else:
w, h = 300, 300
else:
w, h = proj_settings.resolution.split('x')
return float(w), float(h)
def update_throw_ratio(proj_settings, context):
"""
Adjust some settings on a camera to achieve a throw ratio
"""
projector = get_projector(context)
# Update properties of the camera.
throw_ratio = proj_settings.get('throw_ratio')
distance = 1
alpha = math.atan((distance/throw_ratio)*.5) * 2
projector.data.lens_unit = 'FOV'
projector.data.angle = alpha
projector.data.sensor_width = 10
projector.data.display_size = 1
# Adjust Texture to fit new camera ###
w, h = get_resolution(proj_settings, context)
aspect_ratio = w/h
inverted_aspect_ratio = 1/aspect_ratio
# Projected Texture
update_projected_texture(proj_settings, context)
# Update spotlight properties.
spot = projector.children[0]
nodes = spot.data.node_tree.nodes['Group'].node_tree.nodes
if bpy.app.version < (2, 81):
nodes['Mapping.001'].scale[0] = 1 / throw_ratio
nodes['Mapping.001'].scale[1] = 1 / throw_ratio * inverted_aspect_ratio
else:
nodes['Mapping.001'].inputs[3].default_value[0] = 1 / throw_ratio
nodes['Mapping.001'].inputs[3].default_value[1] = 1 / \
throw_ratio * inverted_aspect_ratio
def update_lens_shift(proj_settings, context):
"""
Apply the shift to the camera and texture.
"""
projector = get_projector(context)
h_shift = proj_settings.get('h_shift', 0.0) / 100
v_shift = proj_settings.get('v_shift', 0.0) / 100
throw_ratio = proj_settings.get('throw_ratio')
# Update the properties of the camera.
cam = projector
cam.data.shift_x = h_shift
cam.data.shift_y = v_shift
# Update spotlight node setup.
spot = projector.children[0]
nodes = spot.data.node_tree.nodes['Group'].node_tree.nodes
if bpy.app.version < (2, 81):
nodes['Mapping.001'].translation[0] = h_shift / throw_ratio
nodes['Mapping.001'].translation[1] = v_shift / throw_ratio
else:
nodes['Mapping.001'].inputs[1].default_value[0] = h_shift / throw_ratio
nodes['Mapping.001'].inputs[1].default_value[1] = v_shift / throw_ratio
def update_resolution(proj_settings, context):
projector = get_projector(context)
nodes = projector.children[0].data.node_tree.nodes['Group'].node_tree.nodes
# Change resolution image texture
nodes['Image Texture'].image = bpy.data.images[f'_proj.tex.{proj_settings.resolution}']
update_throw_ratio(proj_settings, context)
update_pixel_grid(proj_settings, context)
def update_checker_color(proj_settings, context):
# Update checker texture color
nodes = get_projector(
context).children[0].data.node_tree.nodes['Group'].node_tree.nodes
c = proj_settings.projected_color
nodes['Checker Texture'].inputs['Color2'].default_value = [c.r, c.g, c.b, 1]
def update_power(proj_settings, context):
# Update spotlight power
spot = get_projector(context).children[0]
spot.data.energy = proj_settings["power"]
def update_pixel_grid(proj_settings, context):
""" Update the pixel grid. Meaning, make it visible by linking the right node and updating the resolution. """
root_tree = get_projector(context).children[0].data.node_tree
nodes = root_tree.nodes
pixel_grid_nodes = nodes['pixel_grid'].node_tree.nodes
width, height = get_resolution(proj_settings, context)
pixel_grid_nodes['_width'].outputs[0].default_value = width
pixel_grid_nodes['_height'].outputs[0].default_value = height
if proj_settings.show_pixel_grid:
root_tree.links.new(nodes['pixel_grid'].outputs[0], nodes['Light Output'].inputs[0])
else:
root_tree.links.new(nodes['Emission'].outputs[0], nodes['Light Output'].inputs[0])
def create_pixel_grid_node_group():
node_group = bpy.data.node_groups.new(
'_Projectors-Addon_PixelGrid', 'ShaderNodeTree')
# Create input/output sockets for the node group.
inputs = node_group.inputs
inputs.new('NodeSocketShader', 'Shader')
inputs.new('NodeSocketVector', 'Vector')
outputs = node_group.outputs
outputs.new('NodeSocketShader', 'Shader')
nodes = node_group.nodes
auto_pos = auto_offset()
group_input = nodes.new('NodeGroupInput')
group_input.location = auto_pos(200)
sepXYZ = nodes.new('ShaderNodeSeparateXYZ')
sepXYZ.location = auto_pos(200)
in_width = nodes.new('ShaderNodeValue')
in_width.name = '_width'
in_width.label = 'Width'
in_width.location = auto_pos(100)
in_height = nodes.new('ShaderNodeValue')
in_height.name = '_height'
in_height.label = 'Height'
in_height.location = auto_pos(y=-200)
mul1 = nodes.new('ShaderNodeMath')
mul1.operation = 'MULTIPLY'
mul1.location = auto_pos(100)
mul2 = nodes.new('ShaderNodeMath')
mul2.operation = 'MULTIPLY'
mul2.location = auto_pos(y=-200)
mod1 = nodes.new('ShaderNodeMath')
mod1.operation = 'MODULO'
mod1.inputs[1].default_value = 1
mod1.location = auto_pos(100)
mod2 = nodes.new('ShaderNodeMath')
mod2.operation = 'MODULO'
mod2.inputs[1].default_value = 1
mod2.location = auto_pos(y=-200)
col_ramp1 = nodes.new('ShaderNodeValToRGB')
col_ramp1.color_ramp.elements[1].position = 0.025
col_ramp1.color_ramp.interpolation = 'CONSTANT'
col_ramp1.location = auto_pos(100)
col_ramp2 = nodes.new('ShaderNodeValToRGB')
col_ramp2.color_ramp.elements[1].position = 0.025
col_ramp2.color_ramp.interpolation = 'CONSTANT'
col_ramp2.location = auto_pos(y=-200)
mix_rgb = nodes.new('ShaderNodeMixRGB')
mix_rgb.use_clamp = True
mix_rgb.blend_type = 'MULTIPLY'
mix_rgb.inputs[0].default_value = 1
mix_rgb.location = auto_pos(200)
transparent = nodes.new('ShaderNodeBsdfTransparent')
transparent.location = auto_pos(y=-200)
mix_shader = nodes.new('ShaderNodeMixShader')
mix_shader.location = auto_pos(100)
group_output = nodes.new('NodeGroupOutput')
group_output.location = auto_pos(100)
# Link Nodes
links = node_group.links
links.new(group_input.outputs[0], mix_shader.inputs[2])
links.new(group_input.outputs[1], sepXYZ.inputs[0])
links.new(in_width.outputs[0], mul1.inputs[1])
links.new(in_height.outputs[0], mul2.inputs[1])
links.new(sepXYZ.outputs[0], mul1.inputs[0])
links.new(sepXYZ.outputs[1], mul2.inputs[0])
links.new(mul1.outputs[0], mod1.inputs[0])
links.new(mul2.outputs[0], mod2.inputs[0])
links.new(mod1.outputs[0], col_ramp1.inputs[0])
links.new(mod2.outputs[0], col_ramp2.inputs[0])
links.new(col_ramp1.outputs[0], mix_rgb.inputs[1])
links.new(col_ramp2.outputs[0], mix_rgb.inputs[2])
links.new(mix_rgb.outputs[0], mix_shader.inputs[0])
links.new(transparent.outputs[0], mix_shader.inputs[1])
links.new(mix_shader.outputs[0], group_output.inputs[0])
return node_group
def create_projector(context):
"""
Create a new projector composed out of a camera (parent obj) and a spotlight (child not intended for user interaction).
The camera is the object intended for the user to manipulate and custom properties are stored there.
The spotlight with a custom nodetree is responsible for actual projection of the texture.
"""
create_projector_textures()
log.debug('Creating projector.')
# Create a camera and a spotlight
# ### Spot Light ###
bpy.ops.object.light_add(type='SPOT', location=(0, 0, 0))
spot = context.object
spot.name = 'Projector.Spot'
spot.scale = (.01, .01, .01)
spot.data.spot_size = math.pi
spot.data.spot_blend = 0
spot.data.shadow_soft_size = 0.00000001
spot.hide_select = True
spot[ADDON_ID.format('spot')] = True
spot.data.cycles.use_multiple_importance_sampling = False
add_projector_node_tree_to_spot(spot)
# ### Camera ###
bpy.ops.object.camera_add(enter_editmode=False,
location=(0, 0, 0),
rotation=(0, 0, 0))
cam = context.object
cam.name = 'Projector'
# Parent light to cam.
spot.parent = cam
# Move newly create projector (cam and spotlight) to 3D-Cursor position.
cam.location = context.scene.cursor.location
cam.rotation_euler = context.scene.cursor.rotation_euler
return cam
def init_projector(proj_settings, context):
# # Add custom properties to store projector settings on the camera obj.
proj_settings.throw_ratio = 0.8
proj_settings.power = 1000.0
proj_settings.projected_texture = Textures.CHECKER.value
proj_settings.h_shift = 0.0
proj_settings.v_shift = 0.0
proj_settings.projected_color = random_color()
proj_settings.resolution = '1920x1080'
proj_settings.use_custom_texture_res = True
# Init Projector
update_throw_ratio(proj_settings, context)
update_projected_texture(proj_settings, context)
update_resolution(proj_settings, context)
update_checker_color(proj_settings, context)
update_lens_shift(proj_settings, context)
update_power(proj_settings, context)
update_pixel_grid(proj_settings, context)
class PROJECTOR_OT_create_projector(Operator):
""" Create Projector """
bl_idname = 'projector.create'
bl_label = 'Create a new Projector'
bl_options = {'REGISTER', 'UNDO'}
def execute(self, context):
projector = create_projector(context)
init_projector(projector.proj_settings, context)
return {'FINISHED'}
def update_projected_texture(proj_settings, context):
""" Update the projected output source. """
projector = get_projectors(context, only_selected=True)[0]
root_tree = projector.children[0].data.node_tree
group_tree = root_tree.nodes['Group'].node_tree
group_output_node = group_tree.nodes['Group Output']
group_node = root_tree.nodes['Group']
emission_node = root_tree.nodes['Emission']
# Switch between the three possible cases by relinking some nodes.
case = proj_settings.projected_texture
if case == Textures.CHECKER.value:
mix_node = group_tree.nodes['Mix.001']
group_tree.links.new(
mix_node.outputs['Color'], group_output_node.inputs[1])
root_tree.links.new(group_node.outputs[1], emission_node.inputs[0])
elif case == Textures.COLOR_GRID.value:
img_node = group_tree.nodes['Image Texture']
group_tree.links.new(img_node.outputs[0], group_output_node.inputs[1])
root_tree.links.new(group_node.outputs[1], emission_node.inputs[0])
elif case == Textures.CUSTOM_TEXTURE.value:
custom_tex_node = root_tree.nodes['Image Texture']
root_tree.links.new(
custom_tex_node.outputs[0], emission_node.inputs[0])
class PROJECTOR_OT_delete_projector(Operator):
bl_idname = 'projector.delete'
bl_label = 'Delete Projector'
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
return bool(get_projectors(context, only_selected=True))
def execute(self, context):
selected_projectors = get_projectors(context, only_selected=True)
for projector in selected_projectors:
for child in projector.children:
bpy.data.objects.remove(child, do_unlink=True)
else:
bpy.data.objects.remove(projector, do_unlink=True)
return {'FINISHED'}
class ProjectorSettings(bpy.types.PropertyGroup):
throw_ratio: bpy.props.FloatProperty(
name="Throw Ratio",
soft_min=0.4, soft_max=3,
update=update_throw_ratio,
subtype='FACTOR')
power: bpy.props.FloatProperty(
name="Projector Power",
soft_min=0, soft_max=999999,
update=update_power,
unit='POWER')
resolution: bpy.props.EnumProperty(
items=RESOLUTIONS,
default='1920x1080',
description="Select a Resolution for your Projector",
update=update_resolution)
use_custom_texture_res: bpy.props.BoolProperty(
name="Let Image Define Projector Resolution",
default=True,
description="Use the resolution from the image as the projector resolution. Warning: After selecting a new image toggle this checkbox to update",
update=update_throw_ratio)
h_shift: bpy.props.FloatProperty(
name="Horizontal Shift",
description="Horizontal Lens Shift",
soft_min=-20, soft_max=20,
update=update_lens_shift,
subtype='PERCENTAGE')
v_shift: bpy.props.FloatProperty(
name="Vertical Shift",
description="Vertical Lens Shift",
soft_min=-20, soft_max=20,
update=update_lens_shift,
subtype='PERCENTAGE')
projected_color: bpy.props.FloatVectorProperty(
subtype='COLOR',
update=update_checker_color)
projected_texture: bpy.props.EnumProperty(
items=PROJECTED_OUTPUTS,
default=Textures.CHECKER.value,
description="What do you to project?",
update=update_throw_ratio)
show_pixel_grid: bpy.props.BoolProperty(
name="Show Pixel Grid",
description="When checked the image is divided into a pixel grid with the dimensions of the image resolution.",
default=False,
update=update_pixel_grid)
def register():
bpy.utils.register_class(ProjectorSettings)
bpy.utils.register_class(PROJECTOR_OT_create_projector)
bpy.utils.register_class(PROJECTOR_OT_delete_projector)
bpy.utils.register_class(PROJECTOR_OT_change_color_randomly)
bpy.types.Object.proj_settings = bpy.props.PointerProperty(
type=ProjectorSettings)
def unregister():
bpy.utils.unregister_class(PROJECTOR_OT_change_color_randomly)
bpy.utils.unregister_class(PROJECTOR_OT_delete_projector)
bpy.utils.unregister_class(PROJECTOR_OT_create_projector)
bpy.utils.unregister_class(ProjectorSettings)