Manipulating Matrices - Revision history

Qaisjp: small notice

2014-11-22T19:23:36Z

small notice

← Older revision		Revision as of 19:23, 22 November 2014
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	~~#REDIRECT~~ [[Matrix]]		A small introduction to Matrices is available at the [[Matrix]] page, in the future, a more in-depth tutorial will be available here.

Qaisjp: Redirected page to Matrix

2014-11-22T18:59:27Z

Redirected page to Matrix

← Older revision		Revision as of 18:59, 22 November 2014
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	~~{{Needs Checking\|should this be on the Matrix page?}}~~		#REDIRECT [[Matrix]]
	~~Matrices are one of the most powerful features of MTA OOP. We did have a presence of Matrices before with [[getElementMatrix]], but we were given an ugly disgusting table to play with.~~
	~~Now, with the new~~ [[Matrix~~]] class, we can make and magically manipulate Matrices.~~

	~~== What is a Matrix? ==~~
	~~A Matrix (plural: Matrices) ...~~

	~~== What can you do with it? ==~~
	Say you wanted to create a bin - object 1337 - two units in front of a player. You don't want to manually do maths sin/cos/tan and you don't want to play with the ugly manual tables. You just want to get the position two units in front of the player whilst taking into account rotation.

	~~It's easy. As simple as:~~
	~~<syntaxhighlight lang="lua">~~
	~~Object ( 1337, player.position + player.matrix.forward * 2 )~~
	~~</syntaxhighlight>~~

	~~Yes, it's just player.matrix.forward * 2. Two units in front of the player!~~

	~~== Why not stick to the good ol' tables? ==~~
	Say you'd like to get find the position underneath a vehicle. The position at any rotation, so if it was upside down, the z value would be higher than the vehicle Z value. If the vehicle was the right way round, the z value for underneath car would be less than the z value for the car. Would you really prefer this?
	~~<syntaxhighlight lang="lua">~~
	~~local matrix = getElementMatrix(vehicle)~~
	~~local offX = 0 * matrix[1][1] + 0 * matrix[2][1] - 1 * matrix[3][1] + matrix[4][1]~~
	~~local offY = 0 * matrix[1][2] + 0 * matrix[2][2] - 1 * matrix[3][2] + matrix[4][2]~~
	~~local offZ = 0 * matrix[1][3] + 0 * matrix[2][3] - 1 * matrix[3][3] + matrix[4][3]~~

	~~local pX, pY, pZ = getElementPosition(vehicle)~~

	~~positionbelow = {offX-pX, offY-pY, offZ-pZ}~~
	~~</syntaxhighlight>~~
	~~than this?~~
	~~<syntaxhighlight lang="lua">~~
	~~positionBelow = vehicle.position - vehicle.matrix.up~~
	~~</syntaxhighlight>~~

	~~Simples.~~
	~~[[Category:Incomplete~~]]

Qaisjp: Fix typo

2014-08-04T01:16:59Z

Fix typo

← Older revision		Revision as of 01:16, 4 August 2014
Line 30:		Line 30:
	than this?		than this?
	<syntaxhighlight lang="lua">		<syntaxhighlight lang="lua">
	positionBelow = vehicle.position - vehicle.matrix.up )		positionBelow = vehicle.position - vehicle.matrix.up
	</syntaxhighlight>		</syntaxhighlight>

	Simples.		Simples.
	[[Category:Incomplete]]		[[Category:Incomplete]]

Lopez: fixed catetory

2014-07-26T07:24:35Z

fixed catetory

← Older revision		Revision as of 07:24, 26 July 2014
Line 34:		Line 34:

	Simples.		Simples.
	[[Category:Incomplete}}		[[Category:Incomplete]]

Ccw at 17:23, 23 June 2014

2014-06-23T17:23:07Z

← Older revision		Revision as of 17:23, 23 June 2014
Line 11:		Line 11:
	It's easy. As simple as:		It's easy. As simple as:
	<syntaxhighlight lang="lua">		<syntaxhighlight lang="lua">
	Object ( 1337, player.matrix.forward * 2 )		Object ( 1337, player.position + player.matrix.forward * 2 )
	</syntaxhighlight>		</syntaxhighlight>

Line 30:		Line 30:
	than this?		than this?
	<syntaxhighlight lang="lua">		<syntaxhighlight lang="lua">
	positionBelow = vehicle.matrix.up * -1		positionBelow = vehicle.position - vehicle.matrix.up )
	</syntaxhighlight>		</syntaxhighlight>

	Simples.		Simples.
	[[Category:Incomplete}}		[[Category:Incomplete}}

Ccw at 17:15, 23 June 2014

2014-06-23T17:15:45Z

← Older revision		Revision as of 17:15, 23 June 2014
Line 11:		Line 11:
	It's easy. As simple as:		It's easy. As simple as:
	<syntaxhighlight lang="lua">		<syntaxhighlight lang="lua">
	Object ( 1337, player.matrix.~~front~~ * 2 )		Object ( 1337, player.matrix.forward * 2 )
	</syntaxhighlight>		</syntaxhighlight>

	Yes, it's just player.matrix.~~front~~ * 2. Two units in front of the player!		Yes, it's just player.matrix.forward * 2. Two units in front of the player!

	== Why not stick to the good ol' tables? ==		== Why not stick to the good ol' tables? ==
Line 30:		Line 30:
	than this?		than this?
	<syntaxhighlight lang="lua">		<syntaxhighlight lang="lua">
	positionBelow = vehicle.matrix.~~top~~ * -1		positionBelow = vehicle.matrix.up * -1
	</syntaxhighlight>		</syntaxhighlight>

	Simples.		Simples.
	[[Category:Incomplete}}		[[Category:Incomplete}}

Qaisjp at 22:50, 19 June 2014

2014-06-19T22:50:30Z

← Older revision		Revision as of 22:50, 19 June 2014
Line 1:		Line 1:
			{{Needs Checking\|should this be on the Matrix page?}}
	Matrices are one of the most powerful features of MTA OOP. We did have a presence of Matrices before with [[getElementMatrix]], but we were given an ugly disgusting table to play with.		Matrices are one of the most powerful features of MTA OOP. We did have a presence of Matrices before with [[getElementMatrix]], but we were given an ugly disgusting table to play with.
	Now, with the new [[Matrix]] class, we can make and magically manipulate Matrices.		Now, with the new [[Matrix]] class, we can make and magically manipulate Matrices.

Qaisjp: Created page with "Matrices are one of the most powerful features of MTA OOP. We did have a presence of Matrices before with getElementMatrix, but we were given an ugly disgusting table to p..."

2014-06-19T22:49:54Z

Created page with "Matrices are one of the most powerful features of MTA OOP. We did have a presence of Matrices before with getElementMatrix, but we were given an ugly disgusting table to p..."

New page

Matrices are one of the most powerful features of MTA OOP. We did have a presence of Matrices before with [[getElementMatrix]], but we were given an ugly disgusting table to play with.
Now, with the new [[Matrix]] class, we can make and magically manipulate Matrices.

== What is a Matrix? ==
A Matrix (plural: Matrices) ...

== What can you do with it? ==
Say you wanted to create a bin - object 1337 - two units in front of a player. You don't want to manually do maths sin/cos/tan and you don't want to play with the ugly manual tables. You just want to get the position two units in front of the player whilst taking into account rotation.

It's easy. As simple as:
<syntaxhighlight lang="lua">
Object ( 1337, player.matrix.front * 2 )
</syntaxhighlight>

Yes, it's just player.matrix.front * 2. Two units in front of the player!

== Why not stick to the good ol' tables? ==
Say you'd like to get find the position underneath a vehicle. The position at any rotation, so if it was upside down, the z value would be higher than the vehicle Z value. If the vehicle was the right way round, the z value for underneath car would be less than the z value for the car. Would you really prefer this?
<syntaxhighlight lang="lua">
local matrix = getElementMatrix(vehicle)
local offX = 0 * matrix[1][1] + 0 * matrix[2][1] - 1 * matrix[3][1] + matrix[4][1]
local offY = 0 * matrix[1][2] + 0 * matrix[2][2] - 1 * matrix[3][2] + matrix[4][2]
local offZ = 0 * matrix[1][3] + 0 * matrix[2][3] - 1 * matrix[3][3] + matrix[4][3]

local pX, pY, pZ = getElementPosition(vehicle)

positionbelow = {offX-pX, offY-pY, offZ-pZ}
</syntaxhighlight>
than this?
<syntaxhighlight lang="lua">
positionBelow = vehicle.matrix.top * -1
</syntaxhighlight>

Simples.
[[Category:Incomplete}}