How to change Particle direction

[Allan]

Hey everyone ! I'm working on applying flame particles on my model but i have a problem.

On the first screenshot, the flames are in the good direction because the values are made manually to be like i want it to be.

In the second screenshot, the values are the same but i moved my unit around and there's a problem : the particle direction doesn't follow the movement of my units. (You can see on the screenshot that the flames are going in the wrong direction because of my "static" values).

If someone has a solution to make the particle working like the first screenshot even if the unit moves, it would be appreciated. 

Thanks !

[Gurken Khan]

@Stan`?

[Stan`]

Hey @Allan

You need to add the following tag to your particle effect:

<use_relative_velocity/>

So in your case:

<?xml version="1.0" encoding="utf-8"?>
<particles>

    <texture>art/textures/particles/flame.png</texture>
    <blend mode="add"/>

    <start_full/>
    <use_relative_velocity/>

    <constant name="emissionrate" value="20.0"/>
    <uniform name="lifetime" min="1.0" max="1.5"/>


    <uniform name="velocity.x" min="-2" max="-2.5"/>
    <uniform name="velocity.y" min="-0.3" max="0.3"/>
    <uniform name="velocity.z" min="2" max="2.5"/>
    <uniform name="velocity.angle" min="-3.14" max="3.14"/>

    <uniform name="size" min="1.0" max="2.0"/>

    <uniform name="color.r" min="0.8" max="1.0"/>
    <copy name="color.g" from="color.r"/>
    <copy name="color.b" from="color.r"/>

</particles>

I removed the following line in my screenshot for it to be straight.

    <uniform name="velocity.x" min="-2" max="-2.5"/>

[hyperion]

2 hours ago, Stan` said:

    <start_full/>
    <use_relative_velocity/>

They are undocumented at https://trac.wildfiregames.com/wiki/ParticleFormat. I just tried to do so but after trying to pass the the captcha about 20 times without success I give up

[Stan`]

Added a small update to the wiki page.

[Stan`]