message: Clarifications, closes
diff: @@ -635,10 +635,13 @@ triangle mesh recognizes the following parameters:
  vec3f(a)[] vertex.normal [data] array of vertex normals
  vec4f[] / vec3fa[] vertex.color [data] array of vertex colors (RGBA/RGB)
  vec2f[] vertex.texcoord [data] array of vertex texture coordinates
  - vec3i(a)[] index [data] array of triangle indices (into vertex.*)
  + vec3i(a)[] index [data] array of triangle indices (into the vertex array(s))
  ------------------ ---------------- -------------------------------------------------
  : Parameters defining a triangle mesh geometry.
  +The `vertex` and `index` arrays are mandatory to creat a valid triangle
  +mesh.
  +
  ### Spheres
  A geometry consisting of individual spheres, each of which can have an
  @@ -1637,7 +1640,7 @@ values of `OSPFrameBufferChannel` listed in the table below.
  Name Description
  ---------------- -----------------------------------------------------------
  OSP_FB_COLOR RGB color including alpha
  - OSP_FB_DEPTH euclidean distance to the camera (_not_ to the image plane)
  + OSP_FB_DEPTH euclidean distance to the camera (_not_ to the image plane), as linear 32\ bit float
  OSP_FB_ACCUM accumulation buffer for progressive refinement
  OSP_FB_VARIANCE estimate of the current variance if OSP_FB_ACCUM is also present, see [rendering]
  ---------------- -----------------------------------------------------------
  