Animated Title: "Dissolving Text" is not working properly

[bobonov]

Describe the bug:
Using the animated title "Dissolving Text" result in an incomplete animation or probably.
I tried to make a rendering using all defeault values, even for the title and the name
But the result is not correct.
I do not know how this effect should be, but for sure the should not be half title reapparing at the end.

1. Basicalli it start with the whole title
2. Then the title start dissolving
3. When it is almost dissolved the title start to reappear one char per time
4. The title do not show completely again, it stop after some char

Probably the title should show char by char and then start dissolving, but for sure it should not half show at the end of the animation

Steps to reproduce the behavior:

1. Go to Anomated Title
2. Select "dissolving Text" effect
3. Click on render

Expected behavior:
A proper animated text.

System Details:

• OpenShot-v2.5.1-dev2-1585970041-166f6938-232f3f79-x86_64
• Operating System / Distro: Windows 10
• Blender: 2.82

Screenshots:
Here is a screenshot of the last frame of the animation.

I attach also the video export
export.zip

[pappou99]

I can confirm this also under Ubuntu.
OpenShot version: 2.5.1-dev2
libopenshot: 0.2.5-dev

Could be an error in libopenshot or dissolve.py

[ferdnyc]

Yeah, I see it — the error is in the particle system lifetime setting, on line 116 of dissolve.py.

openshot-qt/src/blender/scripts/dissolve.py

Lines 111 to 118 in 03b8f8d

	bpy.ops.object.particle_system_add()
	# Particle parameters
	ActiveObjectText.particle_systems[0].settings.count = NbQuads
	ActiveObjectText.particle_systems[0].settings.frame_start = 10
	ActiveObjectText.particle_systems[0].settings.frame_end = 60
	ActiveObjectText.particle_systems[0].settings.lifetime = 80
	ActiveObjectText.particle_systems[0].point_cache.frame_step = 1
	ActiveObjectText.particle_systems[0].settings.normal_factor = 0.0

Because the particle system starts affecting particles in frame 10, with a lifetime of 80 some of the earliest particles will start to die off at frame 90, before the 128-frame animation is complete. It appears that, when particles die, they "reset" to their starting point.

The lifetime value should be 120, to ensure that the particle system keeps control of all particles for the entire duration of the animation.

[ferdnyc]

I just merged that change, which you can test by downloading the most recent Daily Build from https://openshot.org/download/

[bobonov]

Just confirming it works, thanks