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How to Shift Direction of an Explosion

Posted: Tue, 26th May 2009, 8:24pm

Post 1 of 7

Kirkeric

Force: 1000 | Joined: 19th Sep 2008 | Posts: 13

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Hello,

Axeman or someone, I am sure has the answer but I am trying to use the preset of Halo Scorpion explosion (something close to that) and it is a ground blast going upward but I want to turn it so that it comes from the left to the right. Basically, imagine a brick wall on the left side and this explosion comes out of the wall.

Normally, i can pretty readily figure out how to adjust the angle but I've tried everything on this and nothing seems to adjust properly. It also currently sort of comes out at the viewer and in this case, I want it to go from left to right.

If there is another preset, that could work but appreciate if someone can assist.

Thanks,

Eric
Posted: Tue, 26th May 2009, 9:42pm

Post 2 of 7

Terminal Velocity

Force: 2507 | Joined: 7th Apr 2008 | Posts: 1350

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For further clarification, could you provide a link or keywords to this preset?

If the gravity is set above 0, it will affect the explosion's direction and speed. You can neutralize it or use it to pull the explosion the way you want it. The disk underneath "Relative to Canvas" sets the angle of the explosion. Also, you might take Angle Range into consideration.

If it seems to be coming towards the screen, that might be because the particle size is set to increase throughout its lifetime.
Posted: Tue, 26th May 2009, 11:47pm

Post 3 of 7

Kirkeric

Force: 1000 | Joined: 19th Sep 2008 | Posts: 13

VisionLab User

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Richard,

Thanks. That is somewhat helpful. Most of that I've toyed with. Not quite there. I got it going sideways but not the whole effect is too far to the right and whenever I drag to left (one of those little squares with A, B, C, D) it begins shooting the opposite way.

Guess I will figure it out.

Has anyone seen an explosion that shows bricks or stone coming out?

Eric

Richard III wrote:

For further clarification, could you provide a link or keywords to this preset?

If the gravity is set above 0, it will affect the explosion's direction and speed. You can neutralize it or use it to pull the explosion the way you want it. The disk underneath "Relative to Canvas" sets the angle of the explosion. Also, you might take Angle Range into consideration.

If it seems to be coming towards the screen, that might be because the particle size is set to increase throughout its lifetime.
Posted: Wed, 27th May 2009, 12:47am

Post 4 of 7

Terminal Velocity

Force: 2507 | Joined: 7th Apr 2008 | Posts: 1350

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The trouble I've always had with presets is that, not having built them yourself, they are harder to modify to your desired result. To start out I would suggest making your own presets, at least for more complicated things like particle effects.

If you drag one square of the emitter to the left, that will not move the effect; rather, it will broaden the area of emission, therefore altering the direction. To move the entire effect, click somewhere inside the quad and then move it; that will move the entire effect. Just make sure, unless you want the effect to move across the screen during playback, that when you move the effect it's on the first frame of its lifetime.

If you want a brick-stone explosion, you probably want to look in the AlamDV2 plugins for that. There might be some stock footage on the following sites:

http://www.finalight.com/-/
http://www.blendernation.com/2007/01/11/detonation-films-effects-stock-footage/
http://www.fotosearch.com/video-footage/explosion.html

Hope this helps somewhat.
Posted: Wed, 27th May 2009, 4:33am

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Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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I didn't really have much trouble changing that preset to shoot left to right. I adjusted the emitter angle to 46, and the gravity angle to 133, and the effect blasted to the right, clear out of frame. Reducing the strength of the gravity and/or the particle speed would help control that if you want.
Posted: Wed, 27th May 2009, 11:21am

Post 6 of 7

Kirkeric

Force: 1000 | Joined: 19th Sep 2008 | Posts: 13

VisionLab User

Gold Member

Thanks Richard and Axeman,

I did make some progress. Keep in mind, I am doing this test just to get an idea for how I want to frame my actual shot. So, in looking at this test shot on youtube, I will want to pan right some with the blast as the guy comes running out. He will run out and as the explosion dissipates some, he will look toward the camera and then it will cut to close up of his face. (the close up of mine was simply to see the clarity in my new HD camera)

So, I have the above improvements and I also need the explosion to continue outward more. Right now you can see it sort of just blows out and stops moving. Gotta work on that.

Anyway, here it is: http://www.youtube.com/watch?v=ga3coI0CwVk

Eric

Richard III wrote:

The trouble I've always had with presets is that, not having built them yourself, they are harder to modify to your desired result. To start out I would suggest making your own presets, at least for more complicated things like particle effects.

If you drag one square of the emitter to the left, that will not move the effect; rather, it will broaden the area of emission, therefore altering the direction. To move the entire effect, click somewhere inside the quad and then move it; that will move the entire effect. Just make sure, unless you want the effect to move across the screen during playback, that when you move the effect it's on the first frame of its lifetime.

If you want a brick-stone explosion, you probably want to look in the AlamDV2 plugins for that. There might be some stock footage on the following sites:

http://www.finalight.com/-/
http://www.blendernation.com/2007/01/11/detonation-films-effects-stock-footage/
http://www.fotosearch.com/video-footage/explosion.html

Hope this helps somewhat.
Posted: Wed, 27th May 2009, 2:21pm

Post 7 of 7

Terminal Velocity

Force: 2507 | Joined: 7th Apr 2008 | Posts: 1350

VisionLab User FXpreset Maker Windows User

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If you want it to keep going, 1: Make sure the explosion speed remains consistent or increases throughout the effect. 2: Turn off the gravity if possible. It's usually unnecessary and hampering in explosions without debris, as nothing falls back to earth. However, I think it would be a good idea to allow the explosion to slowly grind to a halt as the shock dissipates.

But again, I think the best idea is to make your own effect.