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Ambient Lighting

Started by SiliconMunky Nov 21, 2003 at 1:41 AM 0 replies 350+ views

Original Post

Nov 21, 2003 at 1:41 AM

Ok, I'm curious as to why my terrain is not being lit by the ambient light? Currently the terrain just gets drawn completly black. Is it that the verticies need a normal to display ambient lighting? I don't beleive so, because one of my models is not being lit either and I know that it has normals. Here's the relevent parts of my code.

//constants
#define D3DFVF_CUSTOMVERTEX	( D3DFVF_XYZ | D3DFVF_DIFFUSE | D3DFVF_TEX1 )

//structures
typedef struct D3DVERTEX
{
	float	fX,	fY,	fZ;
	DWORD	dwColor;
	FLOAT   tu, tv;   // The texture coordinates
} D3DVERTEX;


//the init part 	
	mlpD3dDevice->SetRenderState( D3DRS_LIGHTING, true );
	mlpD3dDevice->SetRenderState( D3DRS_AMBIENT,RGB(255,255,255));	


//the colour of each vertex is set as
pVertexData[index].dwColor = 0xffaaaaaa; //color


//the render part
void CMap::Draw(void)
{
	D3DXMATRIXA16 matWorld;
	D3DXMatrixIdentity(&matWorld);
	mlpD3DDevice->SetTransform( D3DTS_WORLD, &matWorld);

	mlpD3DDevice->SetTexture( 0, mlpTexture );
	mlpD3DDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

	mlpD3DDevice->SetStreamSource(0,m_pTerrainVB,0,sizeof(D3DVERTEX));
	mlpD3DDevice->SetIndices(m_pTerrainIB);
	mlpD3DDevice->DrawIndexedPrimitive( D3DPT_TRIANGLELIST, 0, 0, m_dwTerrainVertices, 0, m_dwTerrainPrimitives);
}

Thanks for any help. Edit: typo [edited by - SiliconMunky on November 21, 2003 2:43:09 AM]

SiliconMunky

Nov 21, 2003 at 2:03 AM

ok, I figured it out. I didn''t have an ambient value set on the material.

This fixed it.


	D3DMATERIAL9 mat;

	// Set the RGBA for diffuse reflection.
	mat.Diffuse.r = 0.5f;
	mat.Diffuse.g = 0.5f;
	mat.Diffuse.b = 0.5f;
	mat.Diffuse.a = 1.0f;

	// Set the RGBA for ambient reflection.
	mat.Ambient.r = 0.5f;
	mat.Ambient.g = 0.5f;
	mat.Ambient.b = 0.5f;
	mat.Ambient.a = 1.0f;

	// Set the color and sharpness of specular highlights.
	mat.Specular.r = 1.0f;
	mat.Specular.g = 1.0f;
	mat.Specular.b = 1.0f;
	mat.Specular.a = 1.0f;
	mat.Power = 50.0f;

	// Set the RGBA for emissive color.
	mat.Emissive.r = 0.0f;
	mat.Emissive.g = 0.0f;
	mat.Emissive.b = 0.0f;
	mat.Emissive.a = 0.0f;

	mlpD3DDevice->SetMaterial(&mat);

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