2 replies to this topic

[Snoob]

Hi,

actually I try to render two connected triangle strips using DirectX 9 and degenerated
triangles but I fail, only the first strip is rendered:

Vertex vertices[] = {
		Vertex(-1.0f,  0.0f,  0.0f, 255,	0,   0, 255),  
		Vertex(-1.0f,  1.0f,  0.0f,   0,  255,   0, 255),
		Vertex( 0.0f,  0.0f,  0.0f,   0,	0, 255, 255),
		
		Vertex( 0.0f,  1.0f,  0.0f,   0,  255, 255, 255),
		Vertex( 1.0f,  0.0f,  0.0f,   0,  255,   0, 255),
		Vertex( 1.0f,  1.0f,  0.0f, 255,  255,   0, 255),

		Vertex( 1.0f,  1.0f,  0.0f, 255,  255,   0, 255),	  //degenerated tris
		 Vertex(-1.0f, -1.0f,  0.0f,   0,  255,  255, 255),	//degenerated tris

		Vertex(-1.0f, -1.0f,  0.0f,   0,  255,  255, 255),
		Vertex(-1.0f,  0.0f,  0.0f, 255,	0,   0,  255),
		Vertex( 0.0f, -1.0f,  0.0f,  255,  255, 255, 255)
};

d3ddev->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 6);

If i understand this correctly, I've only add a degenerated
triangle to connect both strips:

http://msdn.microsof...v=vs.85%29.aspx

With OpenGL everything is working as expected, but with
DirectX is I could only render the first strip ...

Thanks for any help.
Snoob

[Reedbeta]

DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 6);
That will only draw the first six triangles, no? Which includes the first strip and the two you marked as degenerate, but none of the second strip. The total number of triangles in the vertex buffer is 9.

[Snoob]

Ahh thanks, Reedbetea. I was blink while I was totally fixed to my vertices
declaration ...