Second Life Forums Archive - Math Question

Adam Ramona

Registered User

Join date: 5 Jan 2005

Posts: 56

02-09-2007 23:39

Transparency, in the editor, is measured 0 - 100, with 100 being fully transparent (I know the editor caps at 90). In script, llSetAlpha, or its llSetPrimitiveParams equivalent, use 0-1, with 0 being fully transparent.

In other words, the ranges are flipped or inverted - is that the correct term?. What is the math for inverting my data similarly. For example, I get a number in the range 0 - 100, eg, 80 which is quite transparent, I divide it by 100 to get it in the 0 -1 range which gives 0.8 which is quite opaque - the opposite of what I want. How do I invert the range once it's been normalised to the 0-1 range?

So that 0.9 becomes 0.1, 0.1 becomes 0.9 and so on?

Apologies if this is a completely stupid question, my mind was "elsewhere" at school

Adam

Seifert Surface

Mathematician

Join date: 14 Jun 2005

Posts: 912

02-10-2007 00:59

1 - x

_____________________

-Seifert Surface
2G!tGLf 2nLt9cG

Adam Ramona

Registered User

Join date: 5 Jan 2005

Posts: 56

02-10-2007 01:44

Thankyou!

Lee Ponzu

What Would Steve Do?

Join date: 28 Jun 2006

Posts: 1,770

02-10-2007 08:48

Adam, Seifert has left the details as an exercise for the student. For example, 1 - 90 will not give you 0.1 as you might hope. (Details left as exercise for the student.)

PS I used to teach high school math. If only I could go back and find all the artistic types who whined, "Why would I ever need math in real life.)

Adam Ramona

Registered User

Join date: 5 Jan 2005

Posts: 56

02-10-2007 17:48

Thanks Lee, I am pretty stupid, but even I got what he meant

I know what you mean though. My son is going through that at the moment. Thing is, he gets it no problem, he just thinks it is "stupid". I keep telling him how I wish I'd paid attention now that I'm working in 3D and audio. Naturally, he loves music, and I keep telling him "math is music is math" but he doesn't believe me. He wants to drop it as soon as he can

It's more about recognising patterns, I guess, and exercising that thought process. Since I never did that, I have enormous trouble being able to extrapolate a simple formula from a simple pattern, such as the question I asked. As soon as someone like Seifert shows me the pattern, I'm like "aaah, of course"

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Math Question - Inverting Ranges?

Math Question - Inverting Ranges?
Adam Ramona Registered User Join date: 5 Jan 2005 Posts: 56	02-09-2007 23:39 Transparency, in the editor, is measured 0 - 100, with 100 being fully transparent (I know the editor caps at 90). In script, llSetAlpha, or its llSetPrimitiveParams equivalent, use 0-1, with 0 being fully transparent. In other words, the ranges are flipped or inverted - is that the correct term?. What is the math for inverting my data similarly. For example, I get a number in the range 0 - 100, eg, 80 which is quite transparent, I divide it by 100 to get it in the 0 -1 range which gives 0.8 which is quite opaque - the opposite of what I want. How do I invert the range once it's been normalised to the 0-1 range? So that 0.9 becomes 0.1, 0.1 becomes 0.9 and so on? Apologies if this is a completely stupid question, my mind was "elsewhere" at school Adam
Seifert Surface Mathematician Join date: 14 Jun 2005 Posts: 912	02-10-2007 00:59 1 - x _____________________ -Seifert Surface 2G!tGLf 2nLt9cG
Adam Ramona Registered User Join date: 5 Jan 2005 Posts: 56	02-10-2007 01:44 Thankyou!
Lee Ponzu What Would Steve Do? Join date: 28 Jun 2006 Posts: 1,770	02-10-2007 08:48 Adam, Seifert has left the details as an exercise for the student. For example, 1 - 90 will not give you 0.1 as you might hope. (Details left as exercise for the student.) PS I used to teach high school math. If only I could go back and find all the artistic types who whined, "Why would I ever need math in real life.)
Adam Ramona Registered User Join date: 5 Jan 2005 Posts: 56	02-10-2007 17:48 Thanks Lee, I am pretty stupid, but even I got what he meant I know what you mean though. My son is going through that at the moment. Thing is, he gets it no problem, he just thinks it is "stupid". I keep telling him how I wish I'd paid attention now that I'm working in 3D and audio. Naturally, he loves music, and I keep telling him "math is music is math" but he doesn't believe me. He wants to drop it as soon as he can It's more about recognising patterns, I guess, and exercising that thought process. Since I never did that, I have enormous trouble being able to extrapolate a simple formula from a simple pattern, such as the question I asked. As soon as someone like Seifert shows me the pattern, I'm like "aaah, of course"