diff --git a/packages/dev/core/src/Lights/Shadows/shadowGenerator.ts b/packages/dev/core/src/Lights/Shadows/shadowGenerator.ts
index f620e6203c8..8b691c16fc6 100644
--- a/packages/dev/core/src/Lights/Shadows/shadowGenerator.ts
+++ b/packages/dev/core/src/Lights/Shadows/shadowGenerator.ts
@@ -1244,7 +1244,7 @@ export class ShadowGenerator implements IShadowGenerator {
             }
 
             if (isTransparent && this.enableSoftTransparentShadow) {
-                effect.setFloat("softTransparentShadowSM", effectiveMesh.visibility * material.alpha);
+                effect.setFloat2("softTransparentShadowSM", effectiveMesh.visibility * material.alpha, this._opacityTexture?.getAlphaFromRGB ? 1 : 0);
             }
 
             if (shadowDepthWrapper) {
diff --git a/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentExtraDeclaration.fx b/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentExtraDeclaration.fx
index 726bf67250f..4720730320f 100644
--- a/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentExtraDeclaration.fx
+++ b/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentExtraDeclaration.fx
@@ -5,7 +5,7 @@
 #if SM_SOFTTRANSPARENTSHADOW == 1
 	#include<bayerDitherFunctions>
 
-    uniform float softTransparentShadowSM;
+    uniform vec2 softTransparentShadowSM;
 #endif
 
 varying float vDepthMetricSM;
diff --git a/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentSoftTransparentShadow.fx b/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentSoftTransparentShadow.fx
index ed1f6bc4f12..56973bae6de 100644
--- a/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentSoftTransparentShadow.fx
+++ b/packages/dev/core/src/Shaders/ShadersInclude/shadowMapFragmentSoftTransparentShadow.fx
@@ -1,3 +1,3 @@
 #if SM_SOFTTRANSPARENTSHADOW == 1
-    if ((bayerDither8(floor(mod(gl_FragCoord.xy, 8.0)))) / 64.0 >= softTransparentShadowSM * alpha) discard;
+    if ((bayerDither8(floor(mod(gl_FragCoord.xy, 8.0)))) / 64.0 >= softTransparentShadowSM.x * alpha) discard;
 #endif
diff --git a/packages/dev/core/src/Shaders/shadowMap.fragment.fx b/packages/dev/core/src/Shaders/shadowMap.fragment.fx
index 2c6d2073e5c..eb478178ae3 100644
--- a/packages/dev/core/src/Shaders/shadowMap.fragment.fx
+++ b/packages/dev/core/src/Shaders/shadowMap.fragment.fx
@@ -15,7 +15,17 @@ void main(void)
 #include<clipPlaneFragment>
 
 #ifdef ALPHATEXTURE
-    float alphaFromAlphaTexture = texture2D(diffuseSampler, vUV).a;
+    vec4 opacityMap = texture2D(diffuseSampler, vUV);
+    
+    float alphaFromAlphaTexture = opacityMap.a;
+
+    #if SM_SOFTTRANSPARENTSHADOW == 1
+        if (softTransparentShadowSM.y == 1.0) {
+            opacityMap.rgb = opacityMap.rgb * vec3(0.3, 0.59, 0.11);
+            alphaFromAlphaTexture = opacityMap.x + opacityMap.y + opacityMap.z;
+        }
+    #endif
+
     #ifdef ALPHATESTVALUE
         if (alphaFromAlphaTexture < ALPHATESTVALUE)
             discard;
@@ -24,9 +34,9 @@ void main(void)
 
 #if SM_SOFTTRANSPARENTSHADOW == 1
     #ifdef ALPHATEXTURE
-        if ((bayerDither8(floor(mod(gl_FragCoord.xy, 8.0)))) / 64.0 >= softTransparentShadowSM * alphaFromAlphaTexture) discard;
+        if ((bayerDither8(floor(mod(gl_FragCoord.xy, 8.0)))) / 64.0 >= softTransparentShadowSM.x * alphaFromAlphaTexture) discard;
     #else
-        if ((bayerDither8(floor(mod(gl_FragCoord.xy, 8.0)))) / 64.0 >= softTransparentShadowSM) discard;
+        if ((bayerDither8(floor(mod(gl_FragCoord.xy, 8.0)))) / 64.0 >= softTransparentShadowSM.x) discard;
     #endif
 #endif