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FROG_Primitives.cpp
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FROG_Primitives.cpp
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#include "FROG_Primitives.h"
#ifdef FROG_OPENGL
void SetNormalArray(GLfloat* VerticesArray, GLfloat* NormalsArray, unsigned int FirstVertex, unsigned int NVertices, unsigned int PolygonSideCount){
for(unsigned int i=0;i<NVertices/PolygonSideCount;i++){
unsigned int offset = (FirstVertex + i*PolygonSideCount)*3;
//unsigned int offset = FirstVertex + i*PolygonSideCount*3;
float NX=0, NY=0, NZ=0;
if(PolygonSideCount>=3){
float& C1X = VerticesArray[offset+0];
float& C1Y = VerticesArray[offset+1];
float& C1Z = VerticesArray[offset+2];
float& C2X = VerticesArray[offset+3];
float& C2Y = VerticesArray[offset+4];
float& C2Z = VerticesArray[offset+5];
float& C3X = VerticesArray[offset+6];
float& C3Y = VerticesArray[offset+7];
float& C3Z = VerticesArray[offset+8];
NX = (C1Y-C2Y)*(C2Z-C3Z) - (C1Z-C2Z)*(C2Y-C3Y);
NY = (C1Z-C2Z)*(C2X-C3X) - (C1X-C2X)*(C2Z-C3Z);
NZ = (C1X-C2X)*(C2Y-C3Y) - (C1Y-C2Y)*(C2X-C3X);
float N = sqrt(NX*NX+NY*NY+NZ*NZ);
NX /= N;NY /= N;NZ /= N;
}
for(unsigned int j=0;j<PolygonSideCount;j++){
NormalsArray[offset+3*j+0]=NX;
NormalsArray[offset+3*j+1]=NY;
NormalsArray[offset+3*j+2]=NZ;
}
}
}
void TransformVerticesArray(GLfloat* VerticesArray, unsigned int NVertices){
GLfloat m[16];
glGetFloatv (GL_MODELVIEW_MATRIX, m);
for(unsigned int i=0;i<NVertices;i++){
unsigned int offset = i*3;
float A = m[0 ]*VerticesArray[offset+0] + m[4 ]*VerticesArray[offset+1] + m[8 ]*VerticesArray[offset+2] + m[12]*1.0f;
float B = m[1 ]*VerticesArray[offset+0] + m[5 ]*VerticesArray[offset+1] + m[9 ]*VerticesArray[offset+2] + m[13]*1.0f;
float C = m[2 ]*VerticesArray[offset+0] + m[6 ]*VerticesArray[offset+1] + m[10]*VerticesArray[offset+2] + m[14]*1.0f;
VerticesArray[offset+0] = A;
VerticesArray[offset+1] = B;
VerticesArray[offset+2] = C;
}
}
void GetVerticesArrayBarycenter(GLfloat* VerticesArray, unsigned int NVertices, float& x, float& y, float& z){
x=0; y=0; z=0;
for(unsigned int i=0;i<NVertices;i++){
x+=VerticesArray[3*i+0];
y+=VerticesArray[3*i+1];
z+=VerticesArray[3*i+2];
}
x/= NVertices;
y/= NVertices;
z/= NVertices;
}
#endif

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