Merge pull request #21 from hborchardt/hborchardt/3dsurface_offset_pr…

…ecision Improve precision of surface3d worldPosition calculation
gl-vis · May 16, 2024 · 4f7404e · 4f7404e
2 parents 682e1a2 + 6c75a5b
commit 4f7404e
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/shaders/contour-vertex.glsl b/shaders/contour-vertex.glsl
@@ -18,7 +18,8 @@ varying vec4 vColor;
 void main() {
   vec3 dataCoordinate = permutation * vec3(uv.xy, height);
   worldCoordinate = objectOffset + dataCoordinate;
-  vec4 worldPosition = model * vec4(worldCoordinate, 1.0);
+  mat4 objectOffsetTranslation = mat4(1.0) + mat4(vec4(0), vec4(0), vec4(0), vec4(objectOffset, 0));
+  vec4 worldPosition = (model * objectOffsetTranslation) * vec4(dataCoordinate, 1.0);
 
   vec4 clipPosition = projection * (view * worldPosition);
   clipPosition.z += zOffset;

diff --git a/shaders/vertex.glsl b/shaders/vertex.glsl
@@ -18,7 +18,8 @@ varying vec4 vColor;
 void main() {
   vec3 localCoordinate = vec3(uv.zw, f.x);
   worldCoordinate = objectOffset + localCoordinate;
-  vec4 worldPosition = model * vec4(worldCoordinate, 1.0);
+  mat4 objectOffsetTranslation = mat4(1.0) + mat4(vec4(0), vec4(0), vec4(0), vec4(objectOffset, 0));
+  vec4 worldPosition = (model * objectOffsetTranslation) * vec4(localCoordinate, 1.0);
   vec4 clipPosition = projection * (view * worldPosition);
   gl_Position = clipPosition;
   kill = f.y;