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Generate a mesh in client code. (#1735)

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Jeffery Myers 2021-04-26 08:30:07 -07:00 committed by GitHub
parent bb33033389
commit b663724293
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1 changed files with 56 additions and 4 deletions
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60
examples/models/models_mesh_generation.c
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@ -11,7 +11,58 @@
#include "raylib.h"
#define NUM_MODELS 8 // Parametric 3d shapes to generate
#define NUM_MODELS 9 // Parametric 3d shapes to generate
void AllocateMeshData(Mesh* mesh, int triangleCount)
{
mesh->vertexCount = triangleCount * 3;
mesh->triangleCount = triangleCount;
mesh->vertices = (float*)MemAlloc(mesh->vertexCount * 3 * sizeof(float));
mesh->texcoords = (float*)MemAlloc(mesh->vertexCount * 2 * sizeof(float));
mesh->normals = (float*)MemAlloc(mesh->vertexCount * 3 * sizeof(float));
}
// generate a simple triangle mesh from code
Mesh MakeMesh()
{
Mesh mesh = { 0 };
AllocateMeshData(&mesh, 1);
// vertex at the origin
mesh.vertices[0] = 0;
mesh.vertices[1] = 0;
mesh.vertices[2] = 0;
mesh.normals[0] = 0;
mesh.normals[1] = 1;
mesh.normals[2] = 0;
mesh.texcoords[0] = 0;
mesh.texcoords[1] = 0;
// vertex at 1,0,2
mesh.vertices[3] = 1;
mesh.vertices[4] = 0;
mesh.vertices[5] = 2;
mesh.normals[3] = 0;
mesh.normals[4] = 1;
mesh.normals[5] = 0;
mesh.texcoords[2] = 0.5f;
mesh.texcoords[3] = 1.0f;
// vertex at 2,0,0
mesh.vertices[6] = 2;
mesh.vertices[7] = 0;
mesh.vertices[8] = 0;
mesh.normals[6] = 0;
mesh.normals[7] = 1;
mesh.normals[8] = 0;
mesh.texcoords[4] = 1;
mesh.texcoords[5] =0;
UploadMesh(&mesh, false);
return mesh;
}
int main(void)
{
@ -37,6 +88,7 @@ int main(void)
models[5] = LoadModelFromMesh(GenMeshTorus(0.25f, 4.0f, 16, 32));
models[6] = LoadModelFromMesh(GenMeshKnot(1.0f, 2.0f, 16, 128));
models[7] = LoadModelFromMesh(GenMeshPoly(5, 2.0f));
models[8] = LoadModelFromMesh(MakeMesh());
// Set checked texture as default diffuse component for all models material
for (int i = 0; i < NUM_MODELS; i++) models[i].materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;
@ -86,9 +138,8 @@ int main(void)
BeginMode3D(camera);
DrawModel(models[currentModel], position, 1.0f, WHITE);
DrawGrid(10, 1.0);
DrawModel(models[currentModel], position, 1.0f, WHITE);
DrawGrid(10, 1.0);
EndMode3D();
@ -106,6 +157,7 @@ int main(void)
case 5: DrawText("TORUS", 680, 10, 20, DARKBLUE); break;
case 6: DrawText("KNOT", 680, 10, 20, DARKBLUE); break;
case 7: DrawText("POLY", 680, 10, 20, DARKBLUE); break;
case 8: DrawText("Parametric(custom)", 580, 10, 20, DARKBLUE); break;
default: break;
}