misc: cleanup comments and formatting in headers

- asset_manager_dcl.h: clarify purpose vs asset_manager.h
- camera_params.h: broaden description to include 3D rendering
- sdf_cpu.h: simplify calc_normal formatting
- platform.h: add missing newline at EOF

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/src/3d/sdf_cpu.h b/src/3d/sdf_cpu.h
index e0f1b3f..e7f9f47 100644
--- a/src/3d/sdf_cpu.h
+++ b/src/3d/sdf_cpu.h
@@ -44,13 +44,9 @@ inline float sdPlane(vec3 p, vec3 n, float h) {
  */
 template <typename F>
 inline vec3 calc_normal(vec3 p, F sdf_func, float e = 0.001f) {
-  const float d2e = 2.0f * e;
-  return vec3(sdf_func(vec3(p.x + e, p.y, p.z)) -
-                  sdf_func(vec3(p.x - e, p.y, p.z)),
-              sdf_func(vec3(p.x, p.y + e, p.z)) -
-                  sdf_func(vec3(p.x, p.y - e, p.z)),
-              sdf_func(vec3(p.x, p.y, p.z + e)) -
-                  sdf_func(vec3(p.x, p.y, p.z - e)))
+  return vec3(sdf_func(vec3(p.x + e, p.y, p.z)) - sdf_func(vec3(p.x - e, p.y, p.z)),
+              sdf_func(vec3(p.x, p.y + e, p.z)) - sdf_func(vec3(p.x, p.y - e, p.z)),
+              sdf_func(vec3(p.x, p.y, p.z + e)) - sdf_func(vec3(p.x, p.y, p.z - e)))
       .normalize();
 }