Directx 3D the farther object covers the nearer object -


i'm new directx in c#, , there question confused me lot, want render 2 cubes on screen, 1 near camera , other far camera, expected nearer 1 in front of further one, in fact, depends on rendering sequence, last rendered 1 in front of other, i've tried clear z-buffer not work @ all, i'm wondering if there i'm doing wrong?

here code snippet

private void form1_load(object sender, eventargs e)     {         presentparameters presentparams = new presentparameters();         presentparams.windowed = true;         presentparams.swapeffect = swapeffect.discard;         presentparams.enableautodepthstencil = true;         presentparams.autodepthstencilformat = depthformat.d16;          device = new device(0, devicetype.hardware, this, createflags.mixedvertexprocessing, presentparams);         device.vertexformat = customvertex.positioncolored.format;         device.renderstate.cullmode = cull.counterclockwise;         device.renderstate.lighting = false;          matrix projection = matrix.perspectivefovlh((float)math.pi / 4, this.width / this.height, 0f, 10000.0f);         device.transform.projection = projection;     }  protected override void onpaint(painteventargs e)     {         cube = new cube(new vector3(0, 0, 0), 5);         cube b = new cube(new vector3(0, 0, 15), 5);         device.clear(clearflags.target | clearflags.zbuffer, color.darkgray, 1, 0);         device.beginscene();         matrix viewmatrix = matrix.lookatlh(cameraposition, targetposition, up);         device.transform.view = viewmatrix;         device.drawindexeduserprimitives(primitivetype.trianglelist, 0, 8, 12, a.indexdata, false, a.getvertices());         device.drawindexeduserprimitives(primitivetype.trianglelist, 0, 8, 12, b.indexdata, false, b.getvertices());         device.endscene();         device.present();     }

alright, fixed problem, changing 

matrix projection = matrix.perspectivefovlh((float)math.pi / 4, this.width / this.height, 0f, 10000.0f);

to

matrix projection = matrix.perspectivefovlh((float)math.pi / 4, this.width / this.height, 1f, 10000.0f);

but don't know reason, , why happens, know that?


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