Grass Node v0.3.x

[bitplane]

bumpity bump bump. check first post for screenie,
here for download:
http://gdlib.net/index.php?name=Downloa ... ails&id=64

grass is now generated from a bitmap

[jclins]

Drools... Wow. Now we just need someone to come up with a suite of weather effects scenenode like snow, rain, tornado, dust storm, etc. That way I can use them to finish my Lion 3D project.

[Colt Rowdow]

Arg, I get compiling errors.:

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424 CGrassPatchSceneNode.cpp [Warning] converting to `irr::u32' from `irr::f32' 
439 CGrassPatchSceneNode.cpp [Warning] passing `float' for converting 2 of `irr::video::SColor::SColor(irr::s32, irr::s32, irr::s32, irr::s32)' 

there are a coupe more, but they are just these errors over again. I am using devcpp with irrlicht 0.14.0 is there anything that I am doing wrong?

[needforhint]

theese are warnings, not errors

[Colt Rowdow]

Sorry for the double post. I found out what was wrong, I forgot to change one of the project options to the correct directories.

[ErUs]

Code: Select all

CGrassPatchSceneNode.cpp [Warning] converting to `irr::u32' from `irr::f32' 

get rid of that warning by doing irr::u32 bleh = (irr::f32) blah; ?

[Guest]

wrong, by doing irr::u32 bleh = (irr::u32) blah; because blah is f32 and has to be converted to u32


ps: erus you sexy bitch

[Xaron]

Hi bitplane,

thanks for the new version!

As I see you did not change the faulty height compution thing. *g*

So I've built in a bilinear interpolation to get the more accurate height from the heightmap.

In CGrassPatchSceneNode.cpp change the following:

line 183:

from

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s32 x1 = (s32) xz.X;
s32 z1 = (s32) xz.Z;

to

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s32 x1 = floorf( xz.X );
s32 z1 = floorf( xz.Z );

and line 189

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if ( x1 < 0 || z1 < 0 || x1 > TerrainHeightMap->getDimension().Width || z1 > TerrainHeightMap->getDimension().Height )

to

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if ( x1 < 0 || z1 < 0 || x1 > TerrainHeightMap->getDimension().Width - 1 || z1 > TerrainHeightMap->getDimension().Height - 1 )

and line 207

replace

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video::SColor c = TerrainHeightMap->getPixel(x1,z1);
height = c.getBlue()* Terrain->getScale().Y; // -  ((rand() % 100) / 25.0f) + 2.0f;

with

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// do some bilinear interpolation to get the real height
f32 ay = TerrainHeightMap->getPixel(x1,z1).getBlue()* Terrain->getScale().Y;
f32 by = TerrainHeightMap->getPixel(x1+1,z1).getBlue()* Terrain->getScale().Y;
f32 cy = TerrainHeightMap->getPixel(x1,z1+1).getBlue()* Terrain->getScale().Y;
f32 dy = TerrainHeightMap->getPixel(x1+1,z1+1).getBlue()* Terrain->getScale().Y;
f32 u = xz.X - (f32)x1;
f32 v = xz.Z - (f32)z1;
height = ay*(1.0f-u)*(1.0f-v) + by*u*(1.0f-v) + cy*(1.0f-u)*v + dy*u*v;

Maybe you can integrate this into your next version?

Best regards - Xaron

[bitplane]

hey thanks Xaron, I was avoiding this. didnt know it was called bilinear interpolation. damn algorithm names! if bilinear is up the outsides then across the middle then i guess the wind is still linear and that needs fixing too. I shall get onto that today and release a new version

[andrei25ni]

looks very nice, bitplane. I can hardly wait to test it.

[bitplane]

okay here goes.. now with bilinear interpolation on wind and height of grass blades.

[etcaptor]

@ bitplane, nice to see that your project is on development, 2.5 looks better than 2.4. I love improvenments. You are very successive. This is one from my favourite topics .
Congratulations!

[Xaron]

Thank you bitplane! This looks great!

Regards - Xaron

[Xaron]

Hi bitplane,

as I use your great node in my project I just want to ask you 2 thing without looking too deep into your code.

What are you doing with the TerrainColourMap and the TerrainGrassMap?

Regards - Xaron

[bitplane]

TerrainColourMap is for changing the colour of the grass to match shadows on the terrain. TerrainGrassMap is grass size and density, brightness is height and alpha is density. iirc these need to be the same size as the heightmap.