Make collision code placement more like original (+ small fixes)

src/collision/ColTriangle.cpp

@@ -0,0 +1,41 @@
+#include "common.h"
+#include "ColTriangle.h"
+
+void
+CColTriangle::Set(const CompressedVector *, int a, int b, int c, uint8 surf, uint8 piece)
+{
+	this->a = a;
+	this->b = b;
+	this->c = c;
+	this->surface = surf;
+}
+
+#ifdef VU_COLLISION
+void
+CColTrianglePlane::Set(const CVector &va, const CVector &vb, const CVector &vc)
+{
+	CVector norm = CrossProduct(vc-va, vb-va);
+	norm.Normalise();
+	float d = DotProduct(norm, va);
+	normal.x = norm.x*4096.0f;
+	normal.y = norm.y*4096.0f;
+	normal.z = norm.z*4096.0f;
+	dist = d*128.0f;
+}
+#else
+void
+CColTrianglePlane::Set(const CVector &va, const CVector &vb, const CVector &vc)
+{
+	normal = CrossProduct(vc-va, vb-va);
+	normal.Normalise();
+	dist = DotProduct(normal, va);
+	CVector an(Abs(normal.x), Abs(normal.y), Abs(normal.z));
+	// find out largest component and its direction
+	if(an.x > an.y && an.x > an.z)
+		dir = normal.x < 0.0f ? DIR_X_NEG : DIR_X_POS;
+	else if(an.y > an.z)
+		dir = normal.y < 0.0f ? DIR_Y_NEG : DIR_Y_POS;
+	else
+		dir = normal.z < 0.0f ? DIR_Z_NEG : DIR_Z_POS;
+}
+#endif