fix diffuse ibl

Author: fbxiang

python/py_package/core/pysapien/__init__.pyi

@@ -1674,7 +1674,7 @@ class Scene():
     def add_active_light(self, pose: Pose, color: numpy.ndarray[numpy.float32], fov: float, tex_path: str, near: float = 0.10000000149011612, far: float = 10.0, shadow_map_size: int = 2048) -> ActiveLightEntity: ...
     def add_camera(self, name: str, width: int, height: int, fovy: float, near: float, far: float) -> CameraEntity: ...
     def add_directional_light(self, direction: numpy.ndarray[numpy.float32], color: numpy.ndarray[numpy.float32], shadow: bool = False, position: numpy.ndarray[numpy.float32] = array([0., 0., 0.], dtype=float32), scale: float = 10.0, near: float = -10.0, far: float = 10.0, shadow_map_size: int = 2048) -> DirectionalLightEntity: ...
-    def add_ground(self, altitude: float, render: bool = True, material: PhysicalMaterial = None, render_material: RenderMaterial = None, render_half_size: numpy.ndarray[numpy.float32] = array([10., 10.], dtype=float32)) -> None: ...
+    def add_ground(self, altitude: float, render: bool = True, material: PhysicalMaterial = None, render_material: RenderMaterial = None, render_half_size: numpy.ndarray[numpy.float32] = array([10., 10.], dtype=float32)) -> ActorStatic: ...
     @typing.overload
     def add_mounted_camera(self, name: str, actor: ActorBase, pose: Pose, width: int, height: int, fovx: float, fovy: float, near: float, far: float) -> CameraEntity: ...
     @typing.overload

vulkan_shader/ibl/deferred.frag

@@ -80,7 +80,7 @@ vec3 getBackgroundColor(vec3 texcoord) {
 vec3 diffuseIBL(vec3 albedo, vec3 N) {
   N = vec3(-N.y, N.z, -N.x);
   vec3 color = textureLod(samplerEnvironment, N, 5).rgb;
-  return color * albedo;
+  return color * albedo / 3.1415926535;
 }
 
 vec3 specularIBL(vec3 fresnel, float roughness, vec3 N, vec3 V) {

vulkan_shader/ibl/gbuffer1.frag

@@ -92,7 +92,7 @@ vec3 getBackgroundColor(vec3 texcoord) {
 vec3 diffuseIBL(vec3 albedo, vec3 N) {
   N = vec3(-N.y, N.z, -N.x);
   vec3 color = textureLod(samplerEnvironment, N, 5).rgb;
-  return color * albedo;
+  return color * albedo / 3.1415926535;
 }
 
 vec3 specularIBL(vec3 fresnel, float roughness, vec3 N, vec3 V) {

vulkan_shader/point/composite1.frag

@@ -81,7 +81,7 @@ vec4 world2camera(vec4 pos) {
 vec3 diffuseIBL(vec3 albedo, vec3 N) {
   N = vec3(-N.y, N.z, -N.x);
   vec3 color = textureLod(samplerEnvironment, N, 5).rgb;
-  return color * albedo;
+  return color * albedo / 3.1415926535;
 }
 
 vec3 specularIBL(vec3 fresnel, float roughness, vec3 N, vec3 V) {

vulkan_shader/point/deferred.frag

@@ -80,7 +80,7 @@ vec3 getBackgroundColor(vec3 texcoord) {
 vec3 diffuseIBL(vec3 albedo, vec3 N) {
   N = vec3(-N.y, N.z, -N.x);
   vec3 color = textureLod(samplerEnvironment, N, 5).rgb;
-  return color * albedo;
+  return color * albedo / 3.1415926535;
 }
 
 vec3 specularIBL(vec3 fresnel, float roughness, vec3 N, vec3 V) {