blender python api patterns

blender_face_lights.py

bl_info = {
    "name": "Match Area Light",
    "author": "Anthony Aragues",
    "version": (1, 2),
    "blender": (2, 90, 0),
    "location": "n > Lights",
    "description": "Rapidly create area lights to match size and orientation of selected faces",
    "warning": "",
    "doc_url": "",
    "category": "Lighting",
}

# This example assumes we have a mesh object in edit-mode

import bpy, bmesh
from mathutils import Vector, Matrix

class LightsOp(bpy.types.Operator):
    bl_idname = 'lights.go'
    bl_label = 'Map Area Light to All Selected'
    
    #this is the operator function that will be called on button press
    def execute(self, context):

        # Get the active mesh
        obj = context.edit_object
        bpy.ops.object.editmode_toggle()
        bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
        bpy.ops.object.editmode_toggle()
        objMesh = bmesh.from_edit_mesh(obj.data)
        #create the lights
        arrLights=[]
        for objFace in objMesh.faces:
            if objFace.select == True:
                objLight={'location':{}, 'direction':{}, 'scale':{'x':0,'y':0,'z':0}}
                objCenter= objFace.calc_center_median()
                objLight['location']=objCenter.to_tuple()
                objLight['direction']=objFace.normal
                intMinX = None
                intMinY = None
                intMinZ = None
                intMaxX = None
                intMaxY = None
                intMaxZ = None
                for objVert in objFace.verts:
                    #coordinates per point per face of selected object
                    arrCo=objVert.co.to_tuple()
                    if intMinX == None or arrCo[0] < intMinX:
                        intMinX=arrCo[0]
                    if intMaxX == None or arrCo[0] > intMaxX:
                        intMaxX=arrCo[0]
                    if intMinY == None or arrCo[1] < intMinY:
                        intMinY=arrCo[1]
                    if intMaxY == None or arrCo[1] > intMaxY:
                        intMaxY=arrCo[1]
                    if intMinZ == None or arrCo[2] < intMinZ:
                        intMinZ=arrCo[2]
                    if intMaxZ == None or arrCo[2] > intMaxZ:
                        intMaxZ=arrCo[2]
                objLight['scale']['x'] = intMaxX-intMinX
                objLight['scale']['y'] = intMaxY-intMinY
                objLight['scale']['z'] = intMaxZ-intMinZ
                print(objLight)
                arrLights.append(objLight)
                
        bpy.ops.object.editmode_toggle()
        for intLight,objLight in enumerate(arrLights):
            objNewLight=bpy.ops.object.light_add(type='AREA', radius=1, align='WORLD', location=objLight['location'])
            #  set the rotation the light in the direction of the normal
            bpy.context.object.rotation_mode = 'QUATERNION'
            bpy.context.object.rotation_quaternion = objLight['direction'].to_track_quat('Z','Y')
            #bpy.context.object.scale( objLight['scale']['x'],objLight['scale']['y'],objLight['scale']['z'] )
            bpy.ops.transform.resize(value=(objLight['scale']['x']/1, objLight['scale']['y']/1, objLight['scale']['z']/1), orient_type='GLOBAL', orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)), 
            orient_matrix_type='GLOBAL', constraint_axis=(False, True, False), mirror=True, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', proportional_size=1, use_proportional_connected=False, use_proportional_projected=False)
        return {"FINISHED"}
                
class LightsPanel(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Light"
    bl_category = "Lights"
    bl_idname = "Light_Panel"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'

    def draw(self, context):
        layout = self.layout
        #start with first camera found
        row = layout.row()
        row.label(text="Create area lights from faces")
        row = layout.row()
        row.label(text="1. Selected faces in edit mode")
        row = layout.row()
        row.label(text="2. Run the tool")
        layout.operator("lights.go",text = 'Create area lights')
                                
def register():
    bpy.utils.register_class(LightsOp)
    bpy.utils.register_class(LightsPanel)


def unregister():
    bpy.utils.unregister_class(LightsOp)
    bpy.utils.unregister_class(LightsPanel)

if __name__ == "__main__":
    register()

Hi,
with blender 3.2 -3.3 on latest macos the addon starts fine but when it comes to it's job, all lights point in one or random directions and not all shape sizes are ok.

Just to let you know!

Thanks in advance

SG

thanks, I've been supporting Blender things on this Discord mostly be happy to work through it, I havent lkooked at that in over 2 years :) Im sur eI could do better https://discord.gg/a47jQdyq

…

On Tue, Jun 21, 2022 at 9:40 PM nurb2kea ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Hi, with blender 3.2 -3.3 on latest macos the addon starts fine but when it comes to it's job, all lights point in one or random directions and not all shape sizes are ok. Just to let you know! Thanks in advance SG — Reply to this email directly, view it on GitHub <https://gist.github.com/16df6602a2ecab06f56dc8a2c7e4c9e0#gistcomment-4208562>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABB3UBQIFJQZNMGEATXLQ3VQJVHXANCNFSM5ZOOW5AQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>