I have a kind of funky color problem with vertex arrays. I load arrays of vertices, colors, and triangle indices as in the following code. The vertices and color arrays are of the same size and have a 1-to-1 correspondence. The triangle array contains a set of faces defined in terms of indices in the vertices array. I compute the color RGB components according to the height (z) value of each vertex. As it turns out, I get a bogus color scheme when rendering the model, all the colors are mixed up. I suspect that my understanding of vertex arrays is flawed so if you see something blatant in the following code please let me know.
Thanks in advance!
// Define a 3D vertex
struct Vertex
{
float x,y,z;
};// Define a 4 component color
struct Color
{
float r,g,b,a;
};// Define a triangular face in terms of indices in an external vertex pool
struct IndexedTriangle
{
unsigned int vertices[3];
};// Define the renderer
struct Renderer
{
// Construct given references to external data
Renderer(
unsigned int vCount,
unsigned int fCount,
Vertex* v,
Color* v,
IndexFace* f
)
{
vertices = v;
colors = c;
faces = f;
vertexCount = vCount;
faceCount = fCount;
}// Number of vertices in vertex pool
unsigned int vertexCount;// Number of faces
unsigned int faceCount;// The external vertex pool
Vertex* vertices;// The external color array
Color* colors;// The external faces
IndexFace* faces;// Prepare for rendering
void initialize();// Render the model
void render();
};void Renderer::initialize()
{
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3,GL_FLOAT,sizeof(Vertex),vertices);glEnableClientState(GL_COLOR_ARRAY);
glColorPointer(4,GL_FLOAT,sizeof(Color),colors);
}void Renderer::render()
{
glDrawElements(
GL_TRIANGLES,
3*faceCount,
GL_UNSIGNED_INT,
faces
);
}
[This message has been edited by Iceman (edited 02-20-2002).]
