I have a larger model, there are 40 texture map, according to the general ways to render efficiency is slow, such as the code below:

 
GlBindTexture (GL_TEXTURE_2D texName [texFileNameIdx]);//texFileNameIdx is the indice of marketers texture 
GlBegin (GL_TRIANGLES); 
GlTexCoord2f (... ); 
GlVertex3f (... ); 
GlTexCoord2f (... ); 
GlVertex3f (... ); 
GlTexCoord2f (... ); 
GlVertex3f (... ); 
GlEnd (); 

Because each triangle may be different texture map to render, so I call glBindTexture to bind different texture to the current unit, such a large number of points if the model speed will be slow, so I adopt the method of texture arrays, vertex and the normal vector of vertex arrays more easily, my code in the following:

 
GlGenBuffers (3, this - & gt; Buffers); 
GlBindBuffer (GL_ARRAY_BUFFER, this - & gt; Buffers [VERTEXBUFFER]); 

GlBufferData (GL_ARRAY_BUFFER, sizeof (GLfloat) * 3 * objInfo - & gt; Points3d. The size (), and this - & gt; Vertexs GL_STATIC_DRAW); 
GlVertexPointer (3, GL_FLOAT, 0, BUFFER_OFFSET (0)); 
GlEnableClientState (GL_VERTEX_ARRAY); 

GlBindBuffer (GL_ARRAY_BUFFER, this - & gt; Buffers [NORMALBUFFER]); 
GlBufferData (GL_ARRAY_BUFFER, sizeof (GLfloat) * 3 * objInfo - & gt; Points3d. The size (), and this - & gt; Normals, GL_STATIC_DRAW); 
GlNormalPointer (GL_FLOAT, 0, BUFFER_OFFSET (0)); 
GlEnableClientState (GL_NORMAL_ARRAY); 

GlBindBuffer (GL_ELEMENT_ARRAY_BUFFER, this - & gt; Buffers [INDICEBUFFER]); 
GlBufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof (GLuint) * 3 * objInfo - & gt; Faces. The size (), and this - & gt; Indices, GL_STATIC_DRAW); 

This code is to use a buffer object to store the vertex array, finally glDrawElements using this method to render,
A texture is better to get a little, but if there is one more texture chart?

CodePudding user response:

To help the top first!
Then, want to ask the building Lord, your model will have a lot after modeling arrays and the normal vector of triangles, after a triangles in the painting you want to add texture to a triangles, due to the many triangles and texture, so you don't know is there any way to these triangles in texture painting is this? Please reply!

CodePudding user response:

I also encountered this problem, don't know the building Lord solve

CodePudding user response:

Only an object, an object can't imagine other better way