Changes

Team Guardian Cube Mapping

674 bytes removed, 04:48, 14 April 2011

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</style><!![endif]--><!!--[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="2050"/></xml><!![endif]--><!!--[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1"/> </o:shapelayout></xml><!![endif]--></head> <body lang=EN-CA style='tab-interval:36.0pt'> <div class=WordSection1> Theory behind the Material Class: <!![if !!supportLists]><span

style='mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;

mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri'><span

style='mso-list:Ignore'>-

<!![endif]>The material class was originally supposed to encapsulate

all material related data, such as textures, colors, reflectivity etc. The

intention was to replace a lot of the functionality of graphic, so that an

way you could have a material attached to many different meshes, so a similar

appearance can be applied amongst many objects. This is similar to the approach

taken by 3DS Max. <!![if !!supportLists]><span

style='mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;

mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri'><span

style='mso-list:Ignore'>-

<!![endif]>This approach proved too invasive for others to

implement, so now I have made Material a category, which will shift

responsibility of drawing the object away from graphic and into Material. How to implement Environmental Cube Mapping <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>1)

<!![endif]>Download and include the iMaterial.h,Material.h and Material.cpp into your project. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>2)

<!![endif]>Add the cube map code from the provided FX file

into your own FX file. If you will be adding there manually, copy the code

between //REF_CUBE_MAP_A# and //END REF_CUBE_MAP_A#, there should be 4 sections

to copy in total <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>3)

<!![endif]>Edit the Configuration.h

file and add “MATERIAL” to the Category

enumeration <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>4)

<!![endif]>Object is now going to need some

adjustments. I’ll break this down into a

few components: <!![if !!supportLists]><span

style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:

Symbol'>·

<!![endif]>iObject.h <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

I.

<!![endif]>Add ‘class iMaterial’to the top of the file with the rest of the declarations <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

II.

<!![endif]>Add a virtual getting and setter for theObject’s material <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

III.

<!![endif]>Add two more virtual functions, one called <span

class=SpellE>getID, receives an int and

returns an int, and second one called <span

class=SpellE>resetID which receives an int and

returns nothing. <!![if !!supportLists]><span

style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:

Symbol'>·

<!![endif]>Object.h <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

I.

<!![endif]>Add a private iMaterial

pointer to the object named rMaterial (you could

change it to w/e you want, but it won’t be as easy to copy/paste code if you

don’t) <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

II.

<!![endif]>Implement the getter and setter in the in theObject header, in the setter, change the category of the object to MATERIAL. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

III.

<!![endif]>Remove the braces after Object’s <span

class=SpellE>preDraw()

function, we are going to need to implement this function in the <span

class=SpellE>cpp. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

IV.

<!![endif]>Add a private int

array called get cubeMapID, which for this

implementation, it

can be an array of 2 items, since reflection depth will not be implemented. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

V.

<!![endif]>Implement getID and <span

class=SpellE>resetID, get id returns the int

at level in the cubeMapID array (return <span

class=SpellE>cubeMapID[level];)

and resetID sets the int at

level in the cubeMapID to -1. <!![if !!supportLists]><span

style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:

Symbol'>·

<!![endif]>Object.cpp <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

I.

<!![endif]>Add ‘#include <spanclass=SpellE>iMaterial.h’ at the top. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

II.

<!![endif]>In the object constructor add ‘<span

class=SpellE>rMaterial = NULL’, just to be safe, also set <span

class=SpellE>cubeMapID [0] and [1] to -1. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

III.

<!![endif]>In the object’s = operator, set <span

class=SpellE>CubeMapID[0]

and [1] to -1. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

IV.

<!![endif]>In the Object’s attach function,<span

style='mso-spacerun:yes'> check if the category is set to MATERIAL and

that rMaterial isn’t NULL, if true, use Material’s <span

class=SpellE>setStage, if category is not set to MATERIALS then use the

code already there (Remember, if reading this is confusing, you can always copy

the code, this is just trying to explain what to do) <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

V.

<!![endif]>Above the draw function, add the implementation

of the preDraw, which is simple. Check if the

category is set to MATERIAL and rMaterial isn’t NULL,

Finally call the preDraw function on <span

class=SpellE>rMaterial and pass it a reference to the object (this), <span

class=SpellE>vertexlist pointer, and scene pointer. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

VI.

<!![endif]>Mod the Object’s draw function to test if the

category is set to MATERIAL, if it is and

rMaterial isn’t NULL, call the draw function

on the material (passing in the object and scene) in place of using the attach

and draw code in the function, the report should occur regardless. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>

VII.

<!![endif]>In the suspend code, check if <span

class=SpellE>rMaterial is NULL, if not, call suspend on it. Do the same

for release. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>5)

<!![endif]>Open Display.cpp,<span

style='mso-spacerun:yes'> #include Material.h

and call the static function connectDevice from

Material, this will give material access to the device and below, call the

static function connectEffect, giving Material access

to the effect file. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>6)

<!![endif]>The system requires a knowledge of the vertices

of the in a mesh, so you have to go to iVertex list

and add two virtual functions,<span

style='mso-spacerun:yes'> ‘int <span

class=SpellE>getNumOfVerts()’ and ‘Vertex* getVertitices()’.

Now you have to go into the VertexList class,

NOTE: If you already have your object’s center and radius calculated or easily

accessible, you can skip this step and alter the code in the Material class to

use that data instead of calculating the center from the vertex list. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>7)

<!![endif]>Open Design.cpp and #include iMaterial.h.<span

style='mso-spacerun:yes'> Add scene->draw(MATERIAL);

to Design’s draw function and scene->draw(MATERIAL); to Design’s <span

class=SpellE>preDraw. This will give you the ability to use the Material classwith your object to give them a nice reflective or refracting effect. How to use Material: To use a material, follow these few steps: <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>1)

<!![endif]>Create a Material: iMaterial<i

style='mso-bidi-font-style:normal'>* mat = CreateMaterial(<span

class=SpellE>contextPointer, numberOfStages, <span

class=SpellE>numberOfSubsets); NOTES: if the material only have one stage and subset, only pass incontext. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>2)

<!![endif]>Setup the material: mat->setup(arrayOfBasicColors,

twoDimensionalTextureArray, arrayOfColorsRepresentingReflection,

arrayOfRefractionPowers, twoDimensionalArrayOfColorsRepresentingRefraction,

the light bends, so if it is equal to 1.0, the light will not bend at all,

where as if it is set to 0.9, it will bend about 10% of the angle of the normal

of the fragment. <!![if !!supportLists]><span

style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><span

style='mso-list:Ignore'>3)

<!![endif]>Set the material onto the object<spanclass=GramE>: object->setMaterial(mat);

NOTE: this will convert the object to a material object and attach the

material. <o:p> </o:p> A quick example of how to make a glass like cube would be: iObject<i

style='mso-bidi-font-style:normal'>* boxy = CreateBox(-10,-10,

-10, 10, 10, 10, “opaque”, Colour(1.0f, 1.0f, 1.0f,1.0f); iMaterial* mat = CreateMaterial(context);

float power = 0.9f; //this is just to sidestep the need for an array

mat->setup(&Colour(0.7f, 0.7f, 0.7f, 0.7f), NULL, &Colour(1.0f,

1.0f, 1.0f, 0.25), &power, &Colour(1.0f, 1.0f, 1.0f, 1.0f));

boxy->setMaterial(mat);<o:p></o:p> I didn’t test the above code so there could be a typo. </div> </body> </html>

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