Shader support for extreme latitude coordinates (#5081)

visgl · Oct 29, 2020 · 306099d · 306099d
1 parent 49bd63c
commit 306099d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/modules/core/src/shaderlib/project/project.glsl.js b/modules/core/src/shaderlib/project/project.glsl.js
@@ -103,9 +103,10 @@ vec2 project_mercator_(vec2 lnglat) {
   if (project_uWrapLongitude) {
     x = mod(x - project_uAntimeridian, 360.0) + project_uAntimeridian;
   }
+  float y = clamp(lnglat.y, -89.9, 89.9);
   return vec2(
     radians(x) + PI,
-    PI + log(tan_fp32(PI * 0.25 + radians(lnglat.y) * 0.5))
+    PI + log(tan_fp32(PI * 0.25 + radians(y) * 0.5))
   );
 }