Zero-color gradient fix for surface

Task-number: QTRD-2329

Change-Id: I616e2e97ac67ddd9fbdf2d0715f5841b3df46561
Change-Id: I616e2e97ac67ddd9fbdf2d0715f5841b3df46561
Reviewed-by: Mika Salmela <mika.salmela@digia.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/src/datavisualization/engine/shaders/surface.frag b/src/datavisualization/engine/shaders/surface.frag
index 9fe7f45b..4b1357b1 100644
--- a/src/datavisualization/engine/shaders/surface.frag
+++ b/src/datavisualization/engine/shaders/surface.frag
@@ -1,6 +1,5 @@
 #version 120
 
-varying highp vec2 UV;
 varying highp vec3 coords_mdl;
 varying highp vec3 position_wrld;
 varying highp vec3 normal_cmr;
@@ -13,7 +12,7 @@ uniform highp float lightStrength;
 uniform highp float ambientStrength;
 
 void main() {
-    highp vec2 gradientUV = vec2(0.5, (coords_mdl.y + 1.0) / 2.0);
+    highp vec2 gradientUV = vec2(0.0, (coords_mdl.y + 1.001) / 2.0); // 1000 pixel texture, we need a margin for 1/1000 rounding error
     highp vec3 materialDiffuseColor = texture2D(textureSampler, gradientUV).xyz;
     highp vec3 materialAmbientColor = vec3(ambientStrength, ambientStrength, ambientStrength) * materialDiffuseColor;
     highp vec3 materialSpecularColor = vec3(1.0, 1.0, 1.0);
@@ -28,12 +27,10 @@ void main() {
     highp vec3 R = reflect(-l, n);
     highp float cosAlpha = clamp(dot(E, R), 0.0, 1.0);
 
-//    gl_FragColor.rgb = materialDiffuseColor;
     gl_FragColor.rgb =
         materialAmbientColor +
         materialDiffuseColor * lightStrength * pow(cosTheta, 2) / distance +
         materialSpecularColor * lightStrength * pow(cosAlpha, 10) / distance;
     gl_FragColor.a = 1.0;
-//    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
 }