hello
i have setup correctly my HLSL for shadow mapping, but the result is incorrect for some value & it si correct for others, please help me to resolve this issue, there is my HLSL :
//------- Constants --------
float4x4 wvp : WORLDVIEWPROJECTION;
float4x4 lightWVP;
float xMaxDepth = 100.0f;
//------- Texture Samplers --------
Texture xColoredTexture;
sampler ColoredTextureSampler = sampler_state { texture = <xColoredTexture> ; magfilter = LINEAR; minfilter = LINEAR; mipfilter=LINEAR; AddressU = mirror; AddressV = mirror;};
Texture xShadowMap;
sampler ShadowMapSampler = sampler_state { texture = <xShadowMap> ; magfilter = LINEAR; minfilter = LINEAR; mipfilter=LINEAR; AddressU = clamp; AddressV = clamp;};
struct SMapVertexToPixel
{
float4 Position : POSITION;
float3 Position2D : TEXCOORD0;
};
struct SMapPixelToFrame
{
float4 Color : COLOR0;
};
struct SSceneVertexToPixel
{
float4 Position : POSITION;
float4 ShadowMapSamplingPos : TEXCOORD0;
float4 RealDistance : TEXCOORD1;
float2 TexCoords : TEXCOORD2;
float3 Position3D : TEXCOORD4;
};
struct SScenePixelToFrame
{
float4 Color : COLOR0;
};
//------- Vertex Shaders --------
SMapVertexToPixel ShadowMapVertexShader( float4 inPos : POSITION)
{
SMapVertexToPixel Output = (SMapVertexToPixel)0;
Output.Position = mul(inPos, lightWVP);
Output.Position2D = Output.Position;
return Output;
}
SSceneVertexToPixel ShadowedSceneVertexShader( float4 inPos : POSITION, float2 inTexCoords : TEXCOORD0, float3 inNormal : NORMAL)
{
SSceneVertexToPixel Output = (SSceneVertexToPixel)0;
Output.Position = mul(inPos, wvp);
Output.ShadowMapSamplingPos = mul(inPos, lightWVP);
Output.RealDistance = Output.ShadowMapSamplingPos.z/xMaxDepth ;
Output.TexCoords = inTexCoords;
Output.Position3D = inPos;
return Output;
}
//------- Pixel Shaders --------
SMapPixelToFrame ShadowMapPixelShader(SMapVertexToPixel PSIn)
{
SMapPixelToFrame Output = (SMapPixelToFrame)0;
Output.Color = PSIn.Position2D.z/xMaxDepth;
return Output;
}
SScenePixelToFrame ShadowedScenePixelShader(SSceneVertexToPixel PSIn)
{
SScenePixelToFrame Output = (SScenePixelToFrame)0;
float2 ProjectedTexCoords;
ProjectedTexCoords[0] = PSIn.ShadowMapSamplingPos.x/PSIn.ShadowMapSamplingPos.w/2.0f +0.5f;
ProjectedTexCoords[1] = -PSIn.ShadowMapSamplingPos.y/PSIn.ShadowMapSamplingPos.w/2.0f +0.5f;
float StoredDepthInShadowMap = tex2D(ShadowMapSampler, ProjectedTexCoords ).x;
if ((PSIn.RealDistance.x - 1.0f/100.0f) <= StoredDepthInShadowMap)
{
float4 ColorComponent = tex2D(ColoredTextureSampler, PSIn.TexCoords);
Output.Color = ColorComponent ;
}
return Output;
}
//------- Techniques --------
technique ShadowMap
{
pass Pass0
{
VertexShader = compile vs_2_0 ShadowMapVertexShader();
PixelShader = compile ps_2_0 ShadowMapPixelShader();
}
}
technique ShadowedScene
{
pass Pass0
{
VertexShader = compile vs_2_0 ShadowedSceneVertexShader();
PixelShader = compile ps_2_0 ShadowedScenePixelShader();
}
}
the value of wvp = WORLD * VIEW * PROJECTION
i have setup the light position on the top of the sphere (0,10,0) (look image) & the sphere has position as (0,3,0), the camera direction is (0,-1,0) & the camera UP DIRECTION is (0,1,0), where are the problem?
the screenshot N°=1 with no translation :
the screen shot N°=2 with translation in positive X-Axis :
