Improve skylight generator a bit.

Weaken the color of the skylights further away from the sun point.

Mess with rotation value a bit so that sunlights don't overlap

Generate a single white skylight for our shadows.

Allow users to define the sun in their scene through yaw and pitch. Will need something to represent this somehow.

Author: Steven Garcia

io_scene_halo/misc/__init__.py

@@ -145,6 +145,21 @@ class Scale_ModelPropertiesGroup(PropertyGroup):
         )
 
 class SkyPropertiesGroup(PropertyGroup):
+    sun_yaw: FloatProperty(
+        name="Sun Yaw",
+        description="Set the yaw for the sun.",
+        default=0.0,
+        min=0.0,
+        max=360.0
+    )
+
+    sun_pitch: FloatProperty(
+        name="Sun Pitch",
+        description="Set the pitch for the sun.",
+        default=0.0,
+        min=0.0,
+        max=360.0
+    )
     zenith_color: FloatVectorProperty(
         name = "Zenith Color",
         description = "Set the color around the bottom rim of the hemisphere",
@@ -254,6 +269,12 @@ def draw(self, context):
         box.label(text="Generate Skylights:")
         col = box.column(align=True)
         row = col.row()
+        row.label(text='Sun Yaw:')
+        row.prop(scene_halo_sky, "sun_yaw", text='')
+        row = col.row()
+        row.label(text='Sun Pitch:')
+        row.prop(scene_halo_sky, "sun_pitch", text='')
+        row = col.row()
         row.label(text='Zenith Color:')
         row.prop(scene_halo_sky, "zenith_color", text='')
         row = col.row()
@@ -363,7 +384,7 @@ def execute(self, context):
         from io_scene_halo.misc import generate_hemisphere
         scene = context.scene
         scene_halo_sky = scene.halo_sky
-        return global_functions.run_code("generate_hemisphere.generate_hemisphere(scene_halo_sky.zenith_color, scene_halo_sky.horizon_color, scene_halo_sky.strength)")
+        return global_functions.run_code("generate_hemisphere.generate_hemisphere(scene_halo_sky.zenith_color, scene_halo_sky.horizon_color, scene_halo_sky.strength, scene_halo_sky.sun_yaw, scene_halo_sky.sun_pitch)")
 
 class ExportLightmap(Operator, ExportHelper):
     """Write a LUV file"""

io_scene_halo/misc/generate_hemisphere.py

@@ -28,34 +28,160 @@
 
 from math import degrees, radians
 
+columm_rot = 14.65
+column_elements = 26
+row_rot = 12.5
+row_elements = 8
+
 def interpolate_color(color_a, color_b, steps):
     color_list = []
     rdelta, gdelta, bdelta = (color_b[0]-color_a[0])/steps, (color_b[1]-color_a[1])/steps, (color_b[2]-color_a[2])/steps
-    r1 = color_a[0]
-    g1 = color_a[1]
-    b1 = color_a[2]
+    r1, g1, b1 = color_a[0], color_a[1], color_a[2]
     color_list.append(color_a)
     for step in range(steps):
         r1 += rdelta
         g1 += gdelta
         b1 += bdelta
         color_list.append((r1, g1, b1))
+
     color_list.append(color_b)
+
     return color_list
 
-def generate_hemisphere(zenith_color, horizon_color, strength):
+def get_center_point(rotation, is_x_axis):
+    light_spacing = row_rot
+    if is_x_axis:
+        light_spacing = columm_rot
+
+    sun_id = round(rotation / light_spacing)
+    
+    return sun_id
+
+def get_percentages(rotation, is_x_axis, color_loops):
+
+    light_spacing = row_rot
+    max_elements = row_elements
+    if is_x_axis:
+        light_spacing = columm_rot
+        max_elements = column_elements
+
+    percentage_list = []
+    postitive_space_list = []
+    negative_space_list = []
+    sun_id = round(rotation / light_spacing)
+    postive_space = max_elements - sun_id + 1
+
+    if color_loops:
+        halved_elements = round(max_elements / 2)
+        for idx in range(halved_elements):
+            percentage = 1 / halved_elements
+            if idx > 0:
+                percentage = percentage * (idx + 1)
+
+            if idx == halved_elements - 1:
+                percentage = 1.0
+
+            negative_space_list.append(percentage)
+            postitive_space_list.append(percentage)
+
+        postitive_space_list.reverse()
+
+        starting_point_list = []
+        if sun_id > halved_elements:
+            
+            starting_point_list_reversed = []
+            for idx in range(sun_id - halved_elements):
+                starting_point_list_reversed.append(negative_space_list[idx])
+
+            starting_point_list_reversed.reverse()
+            starting_point_list = starting_point_list_reversed
+
+            for idx in range(sun_id - halved_elements):
+                starting_point_list.append(negative_space_list[idx])
+
+            middle_point_list_reversed = []
+            for idx in range(max_elements - sun_id):
+                middle_point_list_reversed.append(postitive_space_list[idx])
+
+            middle_point_list_reversed.reverse()
+            starting_point_list = starting_point_list + middle_point_list_reversed
+
+            for idx in range(max_elements - sun_id):
+                starting_point_list.append(postitive_space_list[idx])
+
+        else:
+            for idx in range(sun_id):
+                starting_point_list.append(negative_space_list[(idx + 1 ) * -1])
+
+            starting_point_list.reverse()
+
+            for idx in range(halved_elements):
+                starting_point_list.append(postitive_space_list[idx])      
+
+            for idx in range(max_elements - (halved_elements + sun_id)):
+                starting_point_list.append(negative_space_list[idx])    
+
+        percentage_list = starting_point_list
+
+    else:
+        for idx in range(sun_id):
+            percentage = 1 / sun_id
+            if idx > 0:
+                percentage = percentage * (idx + 1)
+
+            if idx == sun_id - 1:
+                percentage = 1.0
+
+            negative_space_list.append(percentage)
+
+        for idx in range(postive_space):
+            percentage = 1 / postive_space
+            if idx > 0:
+                percentage = percentage * (idx + 1)
+
+            if not percentage == 1.0:
+                postitive_space_list.append(percentage)
+
+        postitive_space_list.reverse()
+        percentage_list = negative_space_list + postitive_space_list
+
+    return percentage_list
+
+def darken_color(color, light_x_idx, light_y_idx, percentage_list_y, percentage_list_x):
+    percentage_y = percentage_list_y[light_y_idx]
+    percentage_x = percentage_list_x[light_x_idx]
+    color_r, color_g, color_b = (color[0], color[1], color[2])
+    color_r_y, color_g_y, color_b_y = (color_r * percentage_y), (color_g * percentage_y), (color_b * percentage_y)
+    color_r_xy, color_g_xy, color_b_xy = ((color_r_y * percentage_x), (color_g_y * percentage_x), (color_b_y * percentage_x))
+    return (color_r_xy, color_g_xy, color_b_xy)
+
+def generate_hemisphere(zenith_color, horizon_color, strength, sun_yaw, sun_pitch):
+    percentage_list_y = get_percentages(sun_yaw, False, False)
+    percentage_list_x = get_percentages(sun_pitch, True, True)
+
+    sun_row_id = get_center_point(sun_yaw, False)
+    sun_column_id = get_center_point(sun_pitch, True)
+
     color_list = interpolate_color(zenith_color, horizon_color, 6)
-    object_list = []
-    for light_row in range(26):
-        for light in range(8):
-            rot_tuple = (radians(90 + (12.5 * light)), 0, radians(18 * light_row))
-            name = 'skylight_%s' % (light + (8 * light_row))
+
+    for light_column in range(column_elements):
+        for light_row in range(row_elements):
+            rot_tuple = (radians(90 + (row_rot * light_row)), 0, radians(columm_rot * light_column))
+            name = 'skylight_%s' % (light_row + (8 * light_column))
+
             light_data = bpy.data.lights.new(name, "SUN")
             object_mesh = bpy.data.objects.new(name, light_data)
             bpy.context.collection.objects.link(object_mesh)
-            object_mesh.data.color = color_list[light]
-            object_mesh.data.energy = strength
+
             object_mesh.rotation_euler = rot_tuple
+            if light_column == sun_column_id and light_row == sun_row_id:
+                print("%s is the sun point. Beat the shit out of him!!!" % name)
+                object_mesh.data.energy = 0.000047
+                object_mesh.data.color = (1.0, 1.0, 1.0)  
+
+            else:
+                object_mesh.data.energy = strength
+                object_mesh.data.color = darken_color(color_list[light_row], light_column, light_row, percentage_list_y, percentage_list_x)
 
     return {'FINISHED'}