thank :)
Frustum Culling - render only near
Author
hi guys,
how do I know the distance from the NEAR frustum culling?
why things that are further away do not want to render.
example, if an object is more than 20 in the shaft will not be rendered,
only the things near to the field of vision.
see:
thank :)
thank :)
Without seeing any code it is hard to tell. Looks like you've got the "In frustum" code wrong or you've set your frustum up smaller than you want.
When you check if an object is in the view frustum you must check the distance from each frustum plane (make sure they all face the same direction). If all planes face inwards, then if all the distances are positive the object is in the frustum. Make the first check you preform be the near plane, store its value and you can then pass it back and then you know the distance an object is from the near plane for any sorting you might need to do.
Post your code for checking if an object is in the frustum. Another thing to check is the near and far planes of any projections you may have setup for rendering.
When you check if an object is in the view frustum you must check the distance from each frustum plane (make sure they all face the same direction). If all planes face inwards, then if all the distances are positive the object is in the frustum. Make the first check you preform be the near plane, store its value and you can then pass it back and then you know the distance an object is from the near plane for any sorting you might need to do.
Post your code for checking if an object is in the frustum. Another thing to check is the near and far planes of any projections you may have setup for rendering.
Author
Quote:Original post by Nanoha
Without seeing any code it is hard to tell. Looks like you've got the "In frustum" code wrong or you've set your frustum up smaller than you want.
..
wow, sorry,
see my cod:
class FrustumCulling:
FrustumCulling::FrustumCulling() // <- Construtor{ }bool FrustumCulling::refresh(){ g_pd3dDevice->GetTransform(D3DTS_PROJECTION, &matProj); g_pd3dDevice->GetTransform(D3DTS_VIEW, &matView); D3DXMatrixMultiply(&matFinal, &matView, &matProj); //left m_Planes[0].a = matFinal._14 + matFinal._13; m_Planes[0].b = matFinal._24 + matFinal._23; m_Planes[0].c = matFinal._34 + matFinal._33; m_Planes[0].d = matFinal._44 + matFinal._43; D3DXPlaneNormalize(&m_Planes[0], &m_Planes[0]); //right m_Planes[1].a = matFinal._14 - matFinal._13; m_Planes[1].b = matFinal._24 - matFinal._23; m_Planes[1].c = matFinal._34 - matFinal._33; m_Planes[1].d = matFinal._44 - matFinal._43; D3DXPlaneNormalize(&m_Planes[1], &m_Planes[1]); //top m_Planes[2].a = matFinal._14 + matFinal._11; m_Planes[2].b = matFinal._24 + matFinal._21; m_Planes[2].c = matFinal._34 + matFinal._31; m_Planes[2].d = matFinal._44 + matFinal._41; D3DXPlaneNormalize(&m_Planes[2], &m_Planes[2]); //Bottom clipping plane m_Planes[3].a = matFinal._14 - matFinal._11; m_Planes[3].b = matFinal._24 - matFinal._21; m_Planes[3].c = matFinal._34 - matFinal._31; m_Planes[3].d = matFinal._44 - matFinal._41; D3DXPlaneNormalize(&m_Planes[3], &m_Planes[3]); ////Near m_Planes[4].a = matFinal._14 - matFinal._12; m_Planes[4].b = matFinal._24 - matFinal._22; m_Planes[4].c = matFinal._34 - matFinal._32; m_Planes[4].d = matFinal._44 - matFinal._42; D3DXPlaneNormalize(&m_Planes[4], &m_Planes[4]); //Far m_Planes[5].a = matFinal._14 + matFinal._12; m_Planes[5].b = matFinal._24 + matFinal._22; m_Planes[5].c = matFinal._34 + matFinal._32; m_Planes[5].d = matFinal._44 + matFinal._42; D3DXPlaneNormalize(&m_Planes[5], &m_Planes[5]); return true;}bool FrustumCulling::checkPoint(D3DXVECTOR3 &pos){ for(int t=0; t<6; t++) { if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(pos.x, pos.y, pos.z)) < 0.0f) return true; } return false;}bool FrustumCulling::checkSphere(D3DXVECTOR3 &pos, float fRadius){ for(int t=0; t<6; t++) { //se for menor que radius retorna true, senão false if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(pos.x, pos.y, pos.z)) < -fRadius) return true; } return false;}bool FrustumCulling::checkBox(D3DXVECTOR3 &min, D3DXVECTOR3 &max){ for(int t=0; t<6; t++) { if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(min.x, min.y, min.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(max.x, min.y, min.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(min.x, max.x, min.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(max.x, max.x, min.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(min.x, min.y, max.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(max.x, min.y, max.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(min.x, max.x, max.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(max.x, max.x, max.z)) >= 0.0f) continue; return true; } return false;}bool FrustumCulling::checkRectangle(D3DXVECTOR3 &Pos, D3DXVECTOR3 &Size){ for(int t=0; t<6; t++) { if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x-Size.x, Pos.y-Size.y, Pos.z-Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x+Size.x, Pos.y-Size.y, Pos.z-Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x-Size.x, Pos.y+Size.y, Pos.z-Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x+Size.x, Pos.y+Size.y, Pos.z-Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x-Size.x, Pos.y-Size.y, Pos.z+Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x+Size.x, Pos.y-Size.y, Pos.z+Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x-Size.x, Pos.y+Size.y, Pos.z+Size.z)) >= 0.0f) continue; if(D3DXPlaneDotCoord(&m_Planes[t], &D3DXVECTOR3(Pos.x+Size.x, Pos.y+Size.y, Pos.z+Size.z)) >= 0.0f) continue; return true; } return false;}and render loop i use checkSphere method
thank you :D
code bool FrustumCulling::checkBox(D3DXVECTOR3 &min, D3DXVECTOR3 &max)
works incorrectly[it sometimes culls the nearast, that it shoudn't]
try my excample
works incorrectly[it sometimes culls the nearast, that it shoudn't]
try my excample
void CCamera::UpdateFrustum(){ D3DXMATRIX VP = GetViewProj (); D3DXVECTOR4 col0(VP(0,0), VP(1,0), VP(2,0), VP(3,0)); D3DXVECTOR4 col1(VP(0,1), VP(1,1), VP(2,1), VP(3,1)); D3DXVECTOR4 col2(VP(0,2), VP(1,2), VP(2,2), VP(3,2)); D3DXVECTOR4 col3(VP(0,3), VP(1,3), VP(2,3), VP(3,3)); // Planes face inward. mFrustumPlanes[0] = (D3DXPLANE)(col2); // near mFrustumPlanes[1] = (D3DXPLANE)(col3 - col2); // far mFrustumPlanes[2] = (D3DXPLANE)(col3 + col0); // left mFrustumPlanes[3] = (D3DXPLANE)(col3 - col0); // right mFrustumPlanes[4] = (D3DXPLANE)(col3 - col1); // top mFrustumPlanes[5] = (D3DXPLANE)(col3 + col1); // bottom for(int i = 0; i < 6; i++) D3DXPlaneNormalize(&mFrustumPlanes, &mFrustumPlanes);}bool CCamera::IsVisible(const e3d_BBox &box){ D3DXVECTOR3 P; D3DXVECTOR3 Q; for(int i = 0; i < 6; ++i) { // For each coordinate axis x, y, z... for(int j = 0; j < 3; ++j) { // Make PQ point in the same direction as the plane normal on this axis. if( mFrustumPlanes[j] >= 0.0f ) { P[j] = box.m_vMin[j]; Q[j] = box.m_vMax[j]; } else { P[j] = box.m_vMax[j]; Q[j] = box.m_vMin[j]; } } float kne=D3DXPlaneDotCoord(&mFrustumPlanes, &Q); if( kne <0 ) return false; } return true;
Author
Original post by e3d_ALiVE
code bool FrustumCulling::checkBox(D3DXVECTOR3 &min, D3DXVECTOR3 &max)
works incorrectly ....
oh right, but i dont use this method.
Now, I want know how i get the distance between camera and object :(
ty
To get the distance between any two vectors you can use D3DXVec3Length() on the difference, i.e.
D3DXVECTOR3 cameraPos = m_pCamera->GetEyeVector();
D3DXVECTOR3 objectPos = m_pStaticMesh->GetWorldPosition();
float distance = D3DXVec3Length( &D3DXVECTOR3( cameraPos - objectPos ) );
D3DXVECTOR3 cameraPos = m_pCamera->GetEyeVector();
D3DXVECTOR3 objectPos = m_pStaticMesh->GetWorldPosition();
float distance = D3DXVec3Length( &D3DXVECTOR3( cameraPos - objectPos ) );
The distance from a point to a plane is the dot product of the plane and the point:
D3DXVECTOR3 vPos(1.0, 2.0, 3.0);float dist = D3DXPlaneDotCoord(&m_Planes[4], &vPos);This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
