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Backface culling support added to tris

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This commit is contained in:
Richard Davey 2017-12-14 02:29:30 +00:00
parent c49f7de3ce
commit b279308234
1 changed files with 23 additions and 2 deletions
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25
v3/src/geom/mesh/Mesh.js
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@ -26,6 +26,8 @@ var Mesh = new Class({
this.fillColor = 0x00ff00;
this.fillAlpha = 1;
this.backfaceCull = true;
this.points = [];
this._tempVec3 = new Vector3();
@ -90,7 +92,10 @@ var Mesh = new Class({
this.project(graphics, b, verts[face.vertices[1].vertexIndex], world);
this.project(graphics, c, verts[face.vertices[2].vertexIndex], world);
graphics.fillTriangle(a.x, a.y, b.x, b.y, c.x, c.y);
if (this.backfaceCull && !this.isBackFacing(a, b, c))
{
graphics.fillTriangle(a.x, a.y, b.x, b.y, c.x, c.y);
}
},
fillPoly: function (graphics, face)
@ -154,7 +159,10 @@ var Mesh = new Class({
this.project(graphics, b, verts[face.vertices[1].vertexIndex], world);
this.project(graphics, c, verts[face.vertices[2].vertexIndex], world);
graphics.strokeTriangle(a.x, a.y, b.x, b.y, c.x, c.y);
if (this.backfaceCull && !this.isBackFacing(a, b, c))
{
graphics.strokeTriangle(a.x, a.y, b.x, b.y, c.x, c.y);
}
},
strokePoly: function (graphics, face)
@ -190,6 +198,19 @@ var Mesh = new Class({
local.y = -point.y * h + h / 2 >> 0;
},
isBackFacing: function (a, b, c)
{
var ax = c.x - a.x;
var ay = c.y - a.y;
var bx = b.x - c.x;
var by = b.y - c.y;
var result = ax * by - ay * bx;
return (result >= 0);
},
setPosition: function (x, y, z)
{
if (x === undefined) { x = 0; }