Surface shadow improvement

Not allowing bias go below 0.001 prevents the shadow acne. Faulty formula
for lighning direction.

Task-number: QTRD-3382
Change-Id: Ided8bf423a961744ace8bef32ae18d6fa2c443ef
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/datavisualization/engine/shaders/surfaceShadowNoTex.frag b/src/datavisualization/engine/shaders/surfaceShadowNoTex.frag
index d6195227..985214be 100644
--- a/src/datavisualization/engine/shaders/surfaceShadowNoTex.frag
+++ b/src/datavisualization/engine/shaders/surfaceShadowNoTex.frag
@@ -49,7 +49,7 @@ void main() {
     highp float cosAlpha = clamp(dot(E, R), 0.0, 1.0);
 
     highp float bias = 0.005 * tan(acos(cosTheta));
-    bias = clamp(bias, 0.0, 0.01);
+    bias = clamp(bias, 0.001, 0.01);
 
     vec4 shadCoords = shadowCoord;
     shadCoords.z -= bias;