Painting on a pre-generated texture map

yrro

05-06-2006 14:19:29

Here's my project:

We're using the terrain for a small game for a class. The ground is supposed to be kind of cartoonish in its coloring, so we're using a hand-drawn texture map as the base image. We do, however, want to have small explosions on the map, which deform the terrain and blacken that spot. We also want it in general to be playable on older video cards.

Its seems to me that what I want to try to use is the InstantBaseTextureEdit texture unit, with our texture as the base texture. However, I'm still fuzzy on the exact order and procedure I need to do to be able to paint on the terrain.

Say, if I want to to just make a 10 pixel by 10 pixel black square on the ground, I would:

Create a brush array that is 10 by 10 (what format do the pixels need to be in? RGBA? Is it a straight array of bytes in RGBARGBARGBA or does it need to be a different format?)
Set the height and width of the brush (is this in bytes or in pixels?)
Set the brush to be my new array.
Set the the "PaintColorCenter" of the brush.

When I do this, I don't see any changes, so it seems I must be doing something wrong?

Here is my config file:



GroupName=PLSM2



Width=1

Height=1



Data2DFormat=HeightField

LandScapeFileName=lemmings



FileSystem=Media/paginglandscape2/terrains/lemmings



NumTextureFormatSupported=19



NumTextureFormatSupported=19



TextureFormatSupported0=Image

TextureFormatSupported1=BaseTexture

TextureFormatSupported2=BaseTexture2

TextureFormatSupported3=InstantBaseTexture

TextureFormatSupported4=InstantBaseTextureEdit

TextureFormatSupported5=Splatting

TextureFormatSupported6=Splatting2

TextureFormatSupported7=Splatting2Edit

TextureFormatSupported8=Splatting4

TextureFormatSupported9=Splatting6

TextureFormatSupported10=Splatting7

TextureFormatSupported11=Splatting7Edit

TextureFormatSupported12=BaseTexture

TextureFormatSupported13=BaseTexture2

TextureFormatSupported14=InstantBaseTexture

TextureFormatSupported15=Splatting3

TextureFormatSupported16=Splatting5

TextureFormatSupported17=SplattingShader

TextureFormatSupported18=InstantBaseTextureShadowed



TextureFormat=InstantBaseTextureEdit

ImageFilename=lemmingsBaseColorMap



ScaleX=500

ScaleY=200

ScaleZ=500



Deformable=yes

SaveDeformation=no

VertexCompression=no

VertexProgramMorph=no

VertexNormals=yes

VertexLit=yes

MaxPixelError=10



NumMatHeightSplat=0



# where to put camera on load.

BaseCameraViewpoint.x=0.0f

BaseCameraViewpoint.y=500.0f

BaseCameraViewpoint.z=0.0f



Baselookat.x=0.0f

Baselookat.y=0.0f

Baselookat.z=0.0f

Any help is appreciated (as would be filling in the "how do I?" section of the wiki. There is good information on what options are available, but not in how you combine them to produce useful results).

Thanks.

tuan kuranes

06-06-2006 15:58:10

Create a brush array that is 10 by 10 (what format do the pixels need to be in? RGBA? Is it a straight array of bytes in RGBARGBARGBA or does it need to be a different format?)
Set the height and width of the brush (is this in bytes or in pixels?)
Set the brush to be my new array.
Set the the "PaintColorCenter" of the brush.

brush array that is 10 by 10 is a Real[100] array.
Set the height and width of the brush is in bytes
you need to set channel of colors of your brush, as for now brush only supports a color. Here's how to set a black brush on current CVS:



const std::vector<Real> rgba;

rgba.reserve(3);

rgba.resize(3);

rgba[0] = 0.0f;

rgba[1] = 0.0f;

rgba[2] = 0.0f;

setOption(setPaintChannelValues", myVector);

yrro

06-06-2006 20:11:43

How does this work if we are using the Ogre SDK (1.2) ? I looked through the SDK-stable PLSM2 source and the option is still "PaintChannel" and takes a uint.

Are the channels just RGBA (0,1,2,3)? is there an enum that I'm missing somewhere?

Thanks for your help.

tuan kuranes

06-06-2006 20:28:49

it was "PaintColor" before

yrro

07-06-2006 00:52:44

I'm feeling very dense right now, but I'm not understanding what I'm doing wrong.

This is my painting code:



void PlayState::Explosions(const Ogre::Vector3& impact)

{

	

	Ogre::Real brush[100];

	for (int i=0; i<100; i++)

	{

		brush[i]=1.f;

	}

	int width=10, height=10;



	Ogre::ColourValue black(0, 0, 0);



	mSceneMgr->setOption("BrushHeight", &height);

	mSceneMgr->setOption("BrushWidth", &width);

	mSceneMgr->setOption("BrushArray", brush);

	mSceneMgr->setOption("PaintColor", &black);



	mSceneMgr->setOption("PaintColorCenter", &impact);

}

I really appreciate the help.

yrro

07-06-2006 04:57:57

Ok, let's try for what's wrong with it aside from the obvious stupidity. This code still doesn't work.

	

Ogre::Real *brush = new Ogre::Real[100];

	for (int i=0; i<100; i++)

	{

		brush[i]=1.f;

	}

	int width=10, height=10;



	Ogre::ColourValue black(0, 0, 0);



	mSceneMgr->setOption("BrushArrayHeight", &height);

	mSceneMgr->setOption("BrushArrayWidth", &width);

	mSceneMgr->setOption("BrushArray", brush);

	mSceneMgr->setOption("PaintColor", &black);



	mSceneMgr->setOption("PaintColorCenter", &impact);