Fix T68290: Baked particles don't render in final frame

Particles baked into memory would never load the final frame because
of an off-by-one error calculating the particles `dietime`.

This value indicates the frame which the particle ceases to exist but
was being set to the end-frame which caused this bug as the scenes
end-frame is inclusive.

While the last frame was properly written and read from memory,
the `dietime` was set to the last frame causing all the particles to be
considered dead when calculating the cached particle system.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_particle_types.h b/source/blender/makesdna/DNA_particle_types.h
index f3d342e4849..268e1412eef 100644
--- a/source/blender/makesdna/DNA_particle_types.h
+++ b/source/blender/makesdna/DNA_particle_types.h
@@ -109,7 +109,12 @@ typedef struct ParticleData {
 
   /** Die-time is not necessarily time+lifetime as. */
   float time, lifetime;
-  /** Particles can die unnaturally (collision). */
+  /**
+   * Particles can die unnaturally (collision).
+   *
+   * \note Particles die on this frame, be sure to add 1 when clamping the lifetime of particles
+   * to inclusive ranges such as the scenes end frame. See: T68290.
+   */
   float dietime;
 
   /**