void Draw(float x, float y, float z, LPDIRECT3D9TEXTURE Texture, RECT Rec)
{
D3DXMatrixLookAtLH(&Mat, //Matrix Stored in
&D3DXVECTOR3(0.0f, 3.0f, -5.0f), //Position of the Camera
&D3DXVECTOR3(0.0f, 0.0f, 0.0f), //Where Camera is looking to
&D3DXVECTOR3(0.0f, 1.0f, 0.0f)); //Points Straight up (for rotation or something?)
ID3DXSprite->SetWorldViewLH(NULL, //World Transformation
&Mat);
D3DXMatrixTransformation(&vMat, NULL, NULL, NULL, NULL, NULL, &D3DXVECTOR3(x, y, z);
ID3DXSprite->Begin(D3DXSPRITE_SORT_DEPTH_BACKTOFRONT);
ID3DXSprite->SetTransform(&vMat);
ID3DXSprite->Draw(Texture, &Rec, NULL, NULL, 0xFFFFFFFF);
ID3DXSprite->End();
}
Camera Positioning
Author
My whole goal here is trying to sort my sprites by the Z-Order, which is not working out to well, I think it's because of how i'm trying to place my camera..
What i'm doing is something like this
(a little drawing function similar to how mine is)
So I have a couple questions I guess..I supposedly set my camera (0, 3, -5) and looking at the orgin, but yet, for my view Transformation I can only set my z coordnate between 0.0, and 1.0?
And secondly, (main question) no matter what z value I pass in there, it always paints the textures in the order I paint them..as if i didn't even put a z value in there..
I'm not an expert on ID3DXSprite, so I'm not 100% sure...
Now, I believe the reason your sprites aren't being sorted correctly is that Begin/End is called for every sprite. If you call Begin/End once for all your sprites, they will be sorted (plus rendering will probably be a lot faster). Also, you don't need to set the view matrix for every sprite. Try changing your code to work like this:
Quote:Original post by kag1
... I supposedly set my camera (0, 3, -5) and looking at the orgin, but yet, for my view Transformation I can only set my z coordnate between 0.0, and 1.0? ...
D3DXMatrixLookAtLH(&Mat, ... ); ID3DXSprite->SetWorldViewLH(NULL, &Mat); Now, I believe the reason your sprites aren't being sorted correctly is that Begin/End is called for every sprite. If you call Begin/End once for all your sprites, they will be sorted (plus rendering will probably be a lot faster). Also, you don't need to set the view matrix for every sprite. Try changing your code to work like this:
D3DXMatrixLookAtLH( &Mat, ... ); ID3DXSprite->SetWorldViewLH( NULL, &Mat ); ID3DXSprite->Begin( D3DXSPRITE_SORT_DEPTH_BACKTOFRONT ); for ( ... ) { Draw( x, y, z, texture, rec ); } ID3DXSprite->End();void Draw( float x, float y, float z, LPDIRECT3D9TEXTURE Texture, RECT Rec ){ D3DXMatrixTransformation( &vMat, NULL, NULL, NULL, NULL, NULL, &D3DXVECTOR3(x, y, z ); ID3DXSprite->SetTransform( &vMat ); ID3DXSprite->Draw( Texture, &Rec, NULL, NULL, 0xFFFFFFFF );}
Author
Wow Great, it works now (kinda) the reason was as you said because they were all in their own Begin and End Sections...
but now..i'm kind of upset I can't turn AlphaBlending on half way through the Begin() - End()..and if I do, it doesn't work..
I have to put them in 2 different Begin() -- End() groups..and then because of that, the Z Orders won't matter between the transparent and non transparent Textures..
not that it matters a whole lot..but...Is there anyway around this one?
Thanks again JohnBolton
but now..i'm kind of upset I can't turn AlphaBlending on half way through the Begin() - End()..and if I do, it doesn't work..
I have to put them in 2 different Begin() -- End() groups..and then because of that, the Z Orders won't matter between the transparent and non transparent Textures..
not that it matters a whole lot..but...Is there anyway around this one?
Thanks again JohnBolton
JohnBolton.Rating++;
Draw the opaque sprites front-to-back (front-to-back is generally faster than back-to-front, but unsorted may be faster than either). Then draw the alpha-blended sprites back-to-front (back-to-front is required so the alpha-blending looks right).
As long as you're not clearing your depth buffer, it shouldn't matter if you have multiple Begin/End calls because all the pixels in the depth buffer are unaffected unless you Clear() them.
are you sure ZTest is enabled? (its a SetRenderState value). and unless you're using pre-transformed and lit vertices (XYZRHW), you can set the maximum/minimum zvalues by changing your perspective transformation matrix (D3DXMatrixPerspectiveFovLH, for example).
while sorting back to front is necessary with alpha blending (unless you get into 'depth slicing' which is a technique to avoid sorting, but its a bit complex), sorting front to back for all your other polys doesn't really provide that much of a speed boost as cards nowadays are very efficient at testing/rendering very quickly, as opposed to using CPU time to sort through all your polygons before sending them off to the graphics card.
are you sure ZTest is enabled? (its a SetRenderState value). and unless you're using pre-transformed and lit vertices (XYZRHW), you can set the maximum/minimum zvalues by changing your perspective transformation matrix (D3DXMatrixPerspectiveFovLH, for example).
while sorting back to front is necessary with alpha blending (unless you get into 'depth slicing' which is a technique to avoid sorting, but its a bit complex), sorting front to back for all your other polys doesn't really provide that much of a speed boost as cards nowadays are very efficient at testing/rendering very quickly, as opposed to using CPU time to sort through all your polygons before sending them off to the graphics card.
Author
Before you said anything ctoan I wasn't even using a Depth Buffer, I created one and turned it on but it still seems to be the same.
I'm not sure if the z-Buffer has any effect on Sprites drawn with the ID3DXSprite?
I'm not sure if the z-Buffer has any effect on Sprites drawn with the ID3DXSprite?
This topic is closed to new replies.
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