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Per object lighting transformation error?

Started by dxCUDA Jun 1, 2012 at 7:32 PM 1 replies 1.1k views

Original Post

Jun 1, 2012 at 7:32 PM

Another day, another issue.

Currently I am rendering a red point light in the world, but seemingly one point light is being applied independently for each object. Obviously I want one point light in the world to effect all objects (objects to share the same lighting). This issue was also apparent with my directional light.

I think it might be an issue either in my shader transforming into clip space and maybe then I need to do a new transformation


 input.p = mul( input.p, World );
 output.p = mul( input.p, View ); 
 output.p = mul( output.p, Projection );

Or the issue is in my baseObject render method, whereby I am rendering something per-object as opposed to globally, or there is a transformation I am missing to incorporate at this level


 void dxBaseModel::render()
 {
 D3DXMatrixIdentity(&posMatrix);
 D3DXMatrixIdentity(&rotMatrix);
 D3DXMatrixIdentity(&meshWorld);
 
 
 D3DXMatrixRotationYawPitchRoll(&rotMatrix, rotation.y, rotation.x, rotation.z);
 D3DXMatrixTranslation(&posMatrix, position.x, position.y, position.z);
 D3DXMatrixMultiply(&meshWorld, &rotMatrix, &posMatrix);
 
 pViewMatrixEffectVariable->SetMatrix(viewMatrix);
 pProjectionMatrixEffectVariable->SetMatrix(projectionMatrix);
 
 myTexture.pTextureSR->SetResource( myTexture.textureSRV[0] );
 myTexture.pBumSR->SetResource(myTexture.textureSRV[1]);
 myTexture.pSpecSR->SetResource(myTexture.textureSRV[2]);
 
 
 D3D10_TECHNIQUE_DESC TechDesc;
 
 pBasicTechnique->GetDesc(&TechDesc);
 
 
 for( UINT p = 0; p < TechDesc.Passes; p++ )
 {
 WVP = meshWorld*viewMatrix*projectionMatrix;
 pWVPMatrixEffectVariable->SetMatrix((float*)&WVP);
 pWorldMatrixEffectVariable->SetMatrix((float*)&meshWorld);
 
 
 pBasicTechnique->GetPassByIndex( p )->Apply( 0 );
 
 pMesh->DrawSubset(0);
 }
 }

Here's an image of the scene to illustrate the issue at hand.

Thanks

dxCUDA

Jun 1, 2012 at 8:44 PM

Progress, but now the world is black,

I was setting


 m_LightVec[lightNum]->pLightVar = pBasicEffect->GetVariableByName( "pLight" );
 m_LightVec[lightNum]->pLightVar->SetRawValue(&m_LightVec[lightNum]->pointLight, 0, sizeof(pointLight));

to:


 m_LightVec[lightNum]->pLightVar = pBasicEffect->GetVariableByName( "pLight" );
 m_LightVec[lightNum]->pLightVar->SetRawValue(&m_LightVec[lightNum]->directionalLight, 0, sizeof(DirectionalLight));

Now I am sure the issue is in my shader to do with the position of the light. I was generating the image above when I by accident, used the directional light pos(dir).


 else if (pLightType == 1)
 {
 lightIntensity = saturate(dot(bumpNormal, +pLight.pos));
 
 // Determine the final diffuse color based on the diffuse color and the amount of light intensity.
 color = saturate(material.Kd * lightIntensity);
 
 // The vector from the surface to the light.
 float3 lightVec = pLight.pos - input.p;
 
 // The distance from surface to light.
 float d = length(lightVec);
 
 //if( d > pLight.range )
 //return float4(0.0f, 0.0f, 0.0f, 0.0f);
 
 // Normalize the light vector.
 lightVec /= d;
 
 //color = color / dot(pLight.att, float3(1.0f, d, d*d)) * textureColor;
 color = color * textureColor;
 
 specularPower1 = 5.0f;//Need to make this modifiable outside of the shader
 if(lightIntensity > 0.0f)
 {
 //Calculate the reflection vector based on the light intensity, normal vector and light direction
 reflection = normalize(2 * lightIntensity * bumpNormal +pLight.pos);
 
 // Determine the amount of specular light based on the reflection vector, viewing direction, and specular power.
 specular = pow(saturate(dot(reflection, lightVec)), specularPower1);
 
 // Use the specular map to determine the intensity of specular light at this pixel.
 specular = specular * specularIntensity;
 
 // Add the specular component last to the output color.
 color = saturate(color + specular);
 }
 //calculate lighting
 I = calcBlinnPhongLighting( material, pLight.color, input.n, -pLight.pos, input.h );

I am still receiving the per-object light error as before still however!

dxCUDA

Jun 2, 2012 at 11:44 AM

Ok, So I think I have fixed every issue under the sun relating to all my previous issues. One issue remains however, there is a very stark contrast between a lit area and the falloff with the lighting.

I've been heavily experimenting and nothing I do seems to have an impact. As I move in the scene the dark area moves towards me and I cannot illuminate this area with the spotlight.

Thanks

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