[Papero]

Hi,

I'm trying to draw a cone, but I cannot figure out how to calculate the points on a circumference, this is my code at the moment:

PHP Code:

public Action Cmd_Cone(int client, int args)
{
    float vClientPos[3];
    float vClientEye[3];
    float vConePos[3];
    
    GetClientEyePosition(client, vClientPos);
    GetClientEyeAngles(client, vClientEye);
    
    TR_TraceRayFilter(vClientPos, vClientEye, MASK_SHOT, RayType_Infinite, Filter_NoSelf, client);
    if (!TR_DidHit())
        return Plugin_Handled;
    
    TR_GetEndPosition(vConePos);
    
    //Height from the ground.
    vConePos[2] += 300.0;
    
    //The circle radius.
    float fRadius = 70.0;
    
    //Draw the cone base.
    TE_SetupBeamRingPoint(vConePos, fRadius, fRadius + 0.1, iBeamSprite, iHaloSprite, 0, 10, 120.0, 2.0, 0.0, {255, 100, 100, 250}, 10, 0);
    TE_SendToAll();
    
    float vStart[3];
    float vEnd[3];
    vStart[2] = vConePos[2];
    
    //Copy the cone position to the new var.
    AddVectors(vEnd, vConePos, vEnd);
    
    //Cone height.
    vEnd[2] = vConePos[2] - 100.0;
    
    //Calcule the point on the circumference.
    vStart[0] = vConePos[0] + (fRadius * Cosine(DegToRad(90.0)));
    vStart[1] = vConePos[1] + (fRadius * Sine(DegToRad(90.0)));
    
    //Draw the first cone line.
    TE_SetupBeamPoints(vEnd, vStart, iBeamSprite, iHaloSprite, 0, 10, 120.0, 2.0, 16.0, 1, 0.0, {255, 100, 100, 250}, 5);
    TE_SendToAll();
    return Plugin_Handled;
} 


And this is what happens when I run that code:




This is the formula that I've used:

x = cx + r * cos(a) y = cy + r * sin(a) Where r is the radius, cx,cy the origin, and a the angle.

[Pelipoika]

If i were to draw a cone i would make the cone completely out of circles that get progressively smaller towards the tip.

[asherkin]

I think you're on the wrong axis, it looks 90 degrees off - add the loop so you're drawing all the lines and it'll probably be obvious.

[Mitchell]

Originally Posted by asherkin I think you're on the wrong axis, it looks 90 degrees off - add the loop so you're drawing all the lines and it'll probably be obvious.

He's using a beamring point which wont go horizontal is his issue.