Basic Geometry Classes

[winter_moon]

I am relativly new to the irrlicht engine and noticed the lack of basic geometry primatives apart from the CTestSceneNode so I am going to try to make up a set of geometry classes not currently included. I will try to make Cylinder, Cone, Sphere with a level of detail and a Basic LOD terrain Class I hope these will be of use to some people. I will post the source of the classes to this thread and would be happy to hear of any errors or improvements anyone else may have.

[winter_moon]

Code: Select all

class CylSampleSceneNode : public scene::ISceneNode
{

	core::aabbox3d<f32> Box;
	video::S3DVertex Vertices[200];
	video::SMaterial Material;
	int Detail;

public:

	CylSampleSceneNode(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id,int detail)
		: scene::ISceneNode(parent, mgr, id)
	{
		Material.Wireframe = false;
		Material.Lighting = false;

		Detail = detail;
		//base vertex
		Vertices[0]  = video::S3DVertex(0,-10,0, 0,-1,0, video::SColor(255,255,255,255), 0, 1); 
		int i;
		float I;
		float Angle;
		Angle = 360/Detail;
		int uv;
		uv = 0;
		//get the base vertexies
		for (i=0;i<(Detail+1);i++)
		{
			I = i;
			if (uv == 0)
			{
				Vertices[i+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,-10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),-1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 0, 0);
				uv = 1;
			}
			else
			{
				Vertices[i+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,-10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),-1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 1, 1);
				uv = 0;
			}
		}
		uv = 0;
		//get top vertex
		Vertices[Detail+1]  = video::S3DVertex(0,10,0, 0,1,0 , video::SColor(255,255,255,255), 0, 0);
		//get the top vertexies
		for (i=0;i<(Detail+1);i++)
		{
			I = i;
			if (uv == 0)
			{
				Vertices[i+1+Detail+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 1, 0);
				uv = 1;
			}
			else
			{
				Vertices[i+1+Detail+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 0, 1);
				uv = 0;
			}
		}

		Box.reset(Vertices[0].Pos);
		for (s32 i=1; i<12; ++i)
			Box.addInternalPoint(Vertices[i].Pos);
	}

	virtual void OnPreRender()
	{
		if (IsVisible)
			SceneManager->registerNodeForRendering(this);

		ISceneNode::OnPreRender();
	}


	virtual void render()
	{
		int i;
		u16 Indices[200];
		//draw base
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)] = 0;
			Indices[(i*3)+1] = i+2;
			Indices[(i*3)+2] = i+1;
		}
		//draw top
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)+(3*Detail)] = Detail+1;
			Indices[(i*3)+1+(3*Detail)] = i+1+Detail+1;
			Indices[(i*3)+2+(3*Detail)] = i+2+Detail+1;
		}
		//draw side 1
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)+(3*Detail)+(3*(Detail-1))] = i+1;
			Indices[(i*3)+1+(3*Detail)+(3*(Detail-1))] = i+2+Detail+1;
			Indices[(i*3)+2+(3*Detail)+(3*(Detail-1))] = i+1+Detail+1;
		}
		//draw side 1
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)+(3*Detail)+(6*(Detail-1))] = i+2+Detail+1;
			Indices[(i*3)+1+(3*Detail)+(6*(Detail-1))] = i+1;
			Indices[(i*3)+2+(3*Detail)+(6*(Detail-1))] = i+2;
		}
		video::IVideoDriver* driver = SceneManager->getVideoDriver();

		driver->setMaterial(Material);
		driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
		driver->drawIndexedTriangleList(&Vertices[0], 2*(Detail+1), &Indices[0], 2*(Detail)-1+2*(Detail-1));
	}

	virtual const core::aabbox3d<f32>& getBoundingBox() const
	{
		return Box;
	}

	virtual s32 getMaterialCount()
	{
		return 1;
	}

	virtual video::SMaterial& getMaterial(s32 i)
	{
		return Material;
	}	
};

[winter_moon]

The class for a cylinder

Code: Select all

class CylSampleSceneNode : public scene::ISceneNode
{

	core::aabbox3d<f32> Box;
	video::S3DVertex Vertices[200];
	video::SMaterial Material;
	int Detail;

public:

	CylSampleSceneNode(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id,int detail)
		: scene::ISceneNode(parent, mgr, id)
	{
		Material.Wireframe = false;
		Material.Lighting = false;

		Detail = detail;
		//base vertex
		Vertices[0]  = video::S3DVertex(0,-10,0, 0,-1,0, video::SColor(255,255,255,255), 0, 1); 
		int i;
		float I;
		float Angle;
		Angle = 360/Detail;
		int uv;
		uv = 0;
		//get the base vertexies
		for (i=0;i<(Detail+1);i++)
		{
			I = i;
			if (uv == 0)
			{
				Vertices[i+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,-10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),-1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 0, 0);
				uv = 1;
			}
			else
			{
				Vertices[i+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,-10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),-1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 1, 1);
				uv = 0;
			}
		}
		uv = 0;
		//get top vertex
		Vertices[Detail+1]  = video::S3DVertex(0,10,0, 0,1,0 , video::SColor(255,255,255,255), 0, 0);
		//get the top vertexies
		for (i=0;i<(Detail+1);i++)
		{
			I = i;
			if (uv == 0)
			{
				Vertices[i+1+Detail+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 1, 0);
				uv = 1;
			}
			else
			{
				Vertices[i+1+Detail+1]  = video::S3DVertex((sin(I*Angle*Pi/180))*10,10,(cos(I*Angle*Pi/180))*10, (sin(I*Angle*Pi/180)),1,(cos(I*Angle*Pi/180)), video::SColor(255,255,255,255), 0, 1);
				uv = 0;
			}
		}

		Box.reset(Vertices[0].Pos);
		for (s32 i=1; i<12; ++i)
			Box.addInternalPoint(Vertices[i].Pos);
	}

	virtual void OnPreRender()
	{
		if (IsVisible)
			SceneManager->registerNodeForRendering(this);

		ISceneNode::OnPreRender();
	}


	virtual void render()
	{
		int i;
		u16 Indices[200];
		//draw base
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)] = 0;
			Indices[(i*3)+1] = i+2;
			Indices[(i*3)+2] = i+1;
		}
		//draw top
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)+(3*Detail)] = Detail+1;
			Indices[(i*3)+1+(3*Detail)] = i+1+Detail+1;
			Indices[(i*3)+2+(3*Detail)] = i+2+Detail+1;
		}
		//draw side 1
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)+(3*Detail)+(3*(Detail-1))] = i+1;
			Indices[(i*3)+1+(3*Detail)+(3*(Detail-1))] = i+2+Detail+1;
			Indices[(i*3)+2+(3*Detail)+(3*(Detail-1))] = i+1+Detail+1;
		}
		//draw side 1
		for (i=0;i<(Detail-1);i++)
		{
			Indices[(i*3)+(3*Detail)+(6*(Detail-1))] = i+2+Detail+1;
			Indices[(i*3)+1+(3*Detail)+(6*(Detail-1))] = i+1;
			Indices[(i*3)+2+(3*Detail)+(6*(Detail-1))] = i+2;
		}
		video::IVideoDriver* driver = SceneManager->getVideoDriver();

		driver->setMaterial(Material);
		driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
		driver->drawIndexedTriangleList(&Vertices[0], 2*(Detail+1), &Indices[0], 2*(Detail)-1+2*(Detail-1));
	}

	virtual const core::aabbox3d<f32>& getBoundingBox() const
	{
		return Box;
	}

	virtual s32 getMaterialCount()
	{
		return 1;
	}

	virtual video::SMaterial& getMaterial(s32 i)
	{
		return Material;
	}	
};

[Electron]

Basic LOD terrain Class

Check out Spintz's geomipmapping terrain scene node (somewhere on these forums plus in IrrlichtNX). Your work may have already been done for you.