Update

leenkx/blender/lnx/props_renderpath.py

@@ -1,5 +1,6 @@
 from typing import Optional
 
+import math
 import bpy
 from bpy.props import *
 
@@ -44,6 +45,18 @@ def update_point_atlas_size_options(scene: bpy.types.Scene, context: bpy.types.C
     return atlas_sizes_from_min(int(rpdat.rp_shadowmap_cube) * 2)
 
 
+def auto_atlas_size(max_lights: int, tile_size: int, tiles_per_light: int) -> int:
+    """Automatically calculate the minimum atlas texture size needed to fit max_lights of a given type."""
+    tiles_needed = max_lights * tiles_per_light
+    grid_size = math.ceil(math.sqrt(tiles_needed))
+    needed_pixels = grid_size * tile_size
+    for size_entry in atlas_sizes:
+        size = int(size_entry[0])
+        if size >= needed_pixels:
+            return size
+    return int(atlas_sizes[-1][0])
+
+
 def update_preset(self, context):
     rpdat = self.lnx_rplist[-1]
 
@@ -332,6 +345,7 @@ class LnxRPListItem(bpy.types.PropertyGroup):
                ('64', '64', '64'),],
         name="Max Lights Shadows", description="Max number of rendered shadow maps that can be visible in the screen. Always equal or lower than Max Lights", default='16')
     rp_shadowmap_atlas: BoolProperty(name="Shadow Map Atlasing", description="Group shadow maps of lights of the same type in the same texture", default=False, update=update_renderpath)
+    rp_shadowmap_atlas_auto: BoolProperty(name="Automatic Atlasing", description="Automatically compute atlas sizes based on max lights and shadow map sizes", default=True, update=update_renderpath)
     rp_shadowmap_atlas_single_map: BoolProperty(name="Shadow Map Atlas single map", description="Use a single texture for all different light types.", default=False, update=update_renderpath)
     rp_shadowmap_atlas_lod: BoolProperty(name="Shadow Map Atlas LOD (Experimental)", description="When enabled, the size of the shadow map will be determined on runtime based on the distance of the light to the camera", default=False, update=update_renderpath)
     rp_shadowmap_transparent: BoolProperty(name="Transparency", description="Enable shadows for transparent objects", default=False, update=update_renderpath)