Use different colors below buildplate.

fixes #8254

2 files changed, 16 insertions, 0 deletions

diff --git a/resources/shaders/overhang.shader b/resources/shaders/overhang.shader
index a43b44f181..e5d200faa2 100644
--- a/resources/shaders/overhang.shader
+++ b/resources/shaders/overhang.shader
@@ -65,6 +65,10 @@ fragment =
 
         highp vec3 grid = vec3(f_vertex.x - floor(f_vertex.x - 0.5), f_vertex.y - floor(f_vertex.y - 0.5), f_vertex.z - floor(f_vertex.z - 0.5));
         finalColor.a = (u_renderError > 0.5) && dot(grid, grid) < 0.245 ? 0.667 : 1.0;
+        if (f_vertex.y < 0.0)
+        {
+            finalColor.rgb = vec3(1.0, 1.0, 1.0) - finalColor.rgb;
+        }
 
         gl_FragColor = finalColor;
     }
@@ -137,6 +141,10 @@ fragment41core =
         finalColor = (u_faceId != gl_PrimitiveID) ? ((-normal.y > u_overhangAngle) ? u_overhangColor : finalColor) : u_faceColor;
 
         frag_color = finalColor;
+        if (f_vertex.y < 0.0)
+        {
+            frag_color.rgb = vec3(1.0, 1.0, 1.0) - frag_color.rgb;
+        }
         vec3 grid = f_vertex - round(f_vertex);
         frag_color.a = (u_renderError > 0.5) && dot(grid, grid) < 0.245 ? 0.667 : 1.0;
     }
diff --git a/resources/shaders/striped.shader b/resources/shaders/striped.shader
index 07ce2bebe6..eba3b73ee7 100644
--- a/resources/shaders/striped.shader
+++ b/resources/shaders/striped.shader
@@ -64,6 +64,10 @@ fragment =
         highp vec3 viewVector = normalize(u_viewPosition - v_vertex);
         highp float NdotR = clamp(dot(viewVector, reflectedLight), 0.0, 1.0);
         finalColor += pow(NdotR, u_shininess) * u_specularColor;
+        if (v_vertex.y < 0.0)
+        {
+            finalColor.rgb = vec3(1.0, 1.0, 1.0) - finalColor.rgb;
+        }
 
         gl_FragColor = finalColor;
         gl_FragColor.a = u_opacity;
@@ -140,6 +144,10 @@ fragment41core =
         finalColor += pow(NdotR, u_shininess) * u_specularColor;
 
         frag_color = finalColor;
+        if (v_vertex.y < 0.0)
+        {
+            frag_color.rgb = vec3(1.0, 1.0, 1.0) - frag_color.rgb;
+        }
         frag_color.a = u_opacity;
     }