Parabola

kitsiba's picture

Hi i'm new to qc.Now I'm trying to work on a composition and i want to draw a parabola( or other curves).In this case i want to use this curve as a blasting fuse of a bomb.So how can i do this?there are plus solutions?In this case which is the best?and the easiest? Thank's to all

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Scratchpole's picture
Re: Parabola

Use a GL Spline, but I think there are issues with them in 10.6.

smokris's picture
Re: Parabola

@Scratchpole: What are the issues?

Scratchpole's picture
Re: Parabola

Sorry I don't know, it was something Cybero mentioned in feedback for my 3DEQ composition: "By the way this construct works well if you replace the cube with something like GL Point or Line, would love to do Splines, but unfortunately, GL Spline just spits its dummy out in SL .6.1."

cybero's picture
Re: Parabola

True, I did find that to be the case Scratchpole, however, that was then and this is now and Splines are now working AOK, I'm pleased to say.

Anyhow, for a blasting fuse on a bomb, wouldn't a reducing Line with a sparkly Particle juxtaposed and both 'descending' in sync be a better solution than using a Spline?

Guess not in regards of curviness.

Scratchpole's picture
Re: Parabola

Glad it's fixed. I suppose you could make the spline decrease in length and use CV/tracking to attach the particle system. Or is there a better way to get the particles to follow?

cybero's picture
Re: Parabola

Well, spline decreasing in length is delving into the world of polynomials 3 separate x,y,z to be concurrently and artfully changed to be decreased in length.

Actually a result of sorts can be achieved by running the same values through to x2 and x3.

A GL Line or a Line patch only has 2 or 1 x,y and z and either can be easily used. Either way it's only one point of an x,y,z set that would need to be changed.

The Particle patch only has one x,y,z set we need to manipulate and only one point of that set.

Here's a hastily drafted example.

No explosions included :-) .

PreviewAttachmentSize
SplineFuse.qtz7 KB

kitsiba's picture
Re: Parabola

cybero wrote:
Well, spline decreasing in length is delving into the world of polynomials 3 separate x,y,z to be concurrently and artfully changed to be decreased in length.

Actually a result of sorts can be achieved by running the same values through to x2 and x3.

A GL Line or a Line patch only has 2 or 1 x,y and z and either can be easily used. Either way it's only one point of an x,y,z set that would need to be changed.

The Particle patch only has one x,y,z set we need to manipulate and only one point of that set.

Here's a hastily drafted example.

No explosions included :-) .

Thank you but I tried to open whit qc an I had an error:Quartz Composer requires an NVIDIA GeForce2 MX, GeForce3, GeForce4 Titanium or GeForce4 MX card or any ATI AGP RADEON card. A minimum of 16 mB VRAM is required.

I use mbp pro 15" with 2.8 intel dual core and nvidia m9600 with 512mb.What's the problem?

cybero's picture
Re: Parabola

Puzzling indeed.

What framework version are you running ?

Is it 4.1 (156.10) ?

Are you on 10.5 ?

I did check this in runtimes - looked good to go generally speaking.

I'm assuming many other .qtz files do open up AOK on your MBP Pro.

Try closing and re opening QC - clears your cache.

Oh - and what version of GL Tools are you on ? - that might be part of this too.