Vector lines in Kos

[qatmix]

Hi

Does anyone her know how i can draw a basic vector line In KOS? Im trying to do some wireframe models and I can only see how do do polys not lines.

Thanks
Q

[Strapping Scherzo]

May I revive this topic? I'm curious to see what the answer is.

[quarn]

Don't know if there is something built in into kos, but you can draw lines by using regular polygons. Here is some code I wrote a couple of years ago to do just that:

Code: Select all

// Draw a line between p1(x,y,z) to p2(x,y,z) with the specified thickness
void q3dFillerWireframeDrawLine(pvr_vertex_t *p1, pvr_vertex_t *p2, float thickness) {
	// create lineVector
	q3dTypeVector lineVector;
	q3dVectorSet3f(&lineVector, p1->x - p2->x, p1->y - p2->y, p1->z - p2->z);
	q3dVectorNormalize(&lineVector);

	// rotate 90 degrees
	float tmp = lineVector.y;
	lineVector.y = lineVector.x;
	lineVector.x = -tmp;

	// apply thickness
	lineVector.x *= thickness/2;
	lineVector.y *= thickness/2;

	// draw
	pvr_vertex_t vert;
	vert.argb = PVR_PACK_COLOR(1, 0, 0, 0);

	// top left
	vert.flags = PVR_CMD_VERTEX;
	vert.x = p1->x - lineVector.x;
	vert.y = p1->y - lineVector.y;
	vert.z = p1->z;
	pvr_prim(&vert, sizeof(pvr_vertex_t));

	// bottom left
	vert.x = p1->x + lineVector.x;
	vert.y = p1->y + lineVector.y;
	vert.z = p1->z;
	pvr_prim(&vert, sizeof(pvr_vertex_t));

	// top right
	vert.x = p2->x - lineVector.x;
	vert.y = p2->y - lineVector.y;
	vert.z = p2->z;
	pvr_prim(&vert, sizeof(pvr_vertex_t));

	// bottom right;
	vert.flags = PVR_CMD_VERTEX_EOL;
	vert.x = p2->x + lineVector.x;
	vert.y = p2->y + lineVector.y;
	vert.z = p2->z;
	pvr_prim(&vert, sizeof(pvr_vertex_t));
}

I'm not sure if this works with newer versions of kos or not, and you should convert it to make use of direct rendering. Ofcourse the line looks pretty edgy if you make the thickness to large, but you can fix that by applying a smooth texture to the polygon with brightnesslevels running from low to high and then to low again, like this: .oOo.

[nymus]

You could use polygons with a "wireframe texture" ie you draw the object just as if you were drawing a normal polygonal object but texture it using a texture with plain middle and coloured edges.