mouse click to manipulate closest vertex

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mouse click to manipulate closest vertex #291218 09/23/09 21:56 09/23/09 21:56
Joined: Feb 2006 Posts: 616 Netherlands cartoon_baboon OP User
cartoon_baboon OP User Joined: Feb 2006 Posts: 616 Netherlands	Hi, once mroe I find my nonexistent programming skills fail me. I've been trying to achieve the following. The camera is from above looking at a flat 3d model. By left clicking the mouse the closest vertex should be selected and manipulated by mouse movement till the mouse is released. dragging the vertex works when I specify a vertex (for example 30): Code: var temp; vec_for_mesh (temp, me, 30); vec_add(temp,vector(mouse_force.x/5,mouse_force.y/5,0)); vec_to_mesh(temp,me,30); However converting screen positions to real world positions, using c_trace and hit.vertex is driving me crazy Could someone please tell me the easiest way to get a c_trace from the mouse position and how to use hit.vertex. Of course maybe I'm barking up completely the wrong tree with this Thanks a lot! Check out my portfolio website!

Re: mouse click to manipulate closest vertex [Re: cartoon_baboon] #291249
09/24/09 06:59 09/24/09 06:59

Joined: Jul 2002
Posts: 4,436
Germany, Luebeck

Xarthor

Expert

Xarthor

Expert

Joined: Jul 2002
Posts: 4,436
Germany, Luebeck

For the tracing part you could try:

Code:

VECTOR trace_from;
VECTOR trace_to;

vec_set(trace_from,vector(mouse_cursor.x,mouse_cursor.y,50));
vec_set(trace_to,vector(mouse_cursor.x,mouse_cursor.y,10000)); // play with the 1000 if the trace is to short

vec_for_screen(trace_from,camera);
vec_for_screen(trace_to,camera);

result = c_trace(trace_from,trace_to,USE_POLYGON|SCAN_TEXTURE);
if(result > 0)
{
  vertex_number = hit.vertex;
}

Now vertex_number contains the closest hit vertex, and you can process it as you like.
Note: not tested!

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