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catangent 2025-04-09 20:00:20 +01:00
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raylib/examples/models/models_point_rendering.c Normal file
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/*******************************************************************************************
*
* raylib example - point rendering
*
* Example originally created with raylib 5.0, last time updated with raylib 5.0
*
* Example contributed by Reese Gallagher (@satchelfrost) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2024 Reese Gallagher (@satchelfrost)
*
********************************************************************************************/
#include "raylib.h"
#include <stdlib.h> // Required for: rand()
#include <math.h> // Required for: cos(), sin()
#define MAX_POINTS 10000000 // 10 million
#define MIN_POINTS 1000 // 1 thousand
// Generate mesh using points
Mesh GenMeshPoints(int numPoints);
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [models] example - point rendering");
Camera camera = {
.position = { 3.0f, 3.0f, 3.0f },
.target = { 0.0f, 0.0f, 0.0f },
.up = { 0.0f, 1.0f, 0.0f },
.fovy = 45.0f,
.projection = CAMERA_PERSPECTIVE
};
Vector3 position = { 0.0f, 0.0f, 0.0f };
bool useDrawModelPoints = true;
bool numPointsChanged = false;
int numPoints = 1000;
Mesh mesh = GenMeshPoints(numPoints);
Model model = LoadModelFromMesh(mesh);
//SetTargetFPS(60);
//--------------------------------------------------------------------------------------
// Main game loop
while(!WindowShouldClose())
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera, CAMERA_ORBITAL);
if (IsKeyPressed(KEY_SPACE)) useDrawModelPoints = !useDrawModelPoints;
if (IsKeyPressed(KEY_UP))
{
numPoints = (numPoints*10 > MAX_POINTS)? MAX_POINTS : numPoints*10;
numPointsChanged = true;
}
if (IsKeyPressed(KEY_DOWN))
{
numPoints = (numPoints/10 < MIN_POINTS)? MIN_POINTS : numPoints/10;
numPointsChanged = true;
}
// Upload a different point cloud size
if (numPointsChanged)
{
UnloadModel(model);
mesh = GenMeshPoints(numPoints);
model = LoadModelFromMesh(mesh);
numPointsChanged = false;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(BLACK);
BeginMode3D(camera);
// The new method only uploads the points once to the GPU
if (useDrawModelPoints)
{
DrawModelPoints(model, position, 1.0f, WHITE);
}
else
{
// The old method must continually draw the "points" (lines)
for (int i = 0; i < numPoints; i++)
{
Vector3 pos = {
.x = mesh.vertices[i*3 + 0],
.y = mesh.vertices[i*3 + 1],
.z = mesh.vertices[i*3 + 2],
};
Color color = {
.r = mesh.colors[i*4 + 0],
.g = mesh.colors[i*4 + 1],
.b = mesh.colors[i*4 + 2],
.a = mesh.colors[i*4 + 3],
};
DrawPoint3D(pos, color);
}
}
// Draw a unit sphere for reference
DrawSphereWires(position, 1.0f, 10, 10, YELLOW);
EndMode3D();
// Draw UI text
DrawText(TextFormat("Point Count: %d", numPoints), 20, screenHeight - 50, 40, WHITE);
DrawText("Up - increase points", 20, 70, 20, WHITE);
DrawText("Down - decrease points", 20, 100, 20, WHITE);
DrawText("Space - drawing function", 20, 130, 20, WHITE);
if (useDrawModelPoints) DrawText("Using: DrawModelPoints()", 20, 160, 20, GREEN);
else DrawText("Using: DrawPoint3D()", 20, 160, 20, RED);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadModel(model);
CloseWindow();
//--------------------------------------------------------------------------------------
return 0;
}
// Generate a spherical point cloud
Mesh GenMeshPoints(int numPoints)
{
Mesh mesh = {
.triangleCount = 1,
.vertexCount = numPoints,
.vertices = (float *)MemAlloc(numPoints*3*sizeof(float)),
.colors = (unsigned char*)MemAlloc(numPoints*4*sizeof(unsigned char)),
};
// https://en.wikipedia.org/wiki/Spherical_coordinate_system
for (int i = 0; i < numPoints; i++)
{
float theta = PI*rand()/RAND_MAX;
float phi = 2.0f*PI*rand()/RAND_MAX;
float r = 10.0f*rand()/RAND_MAX;
mesh.vertices[i*3 + 0] = r*sin(theta)*cos(phi);
mesh.vertices[i*3 + 1] = r*sin(theta)*sin(phi);
mesh.vertices[i*3 + 2] = r*cos(theta);
Color color = ColorFromHSV(r*360.0f, 1.0f, 1.0f);
mesh.colors[i*4 + 0] = color.r;
mesh.colors[i*4 + 1] = color.g;
mesh.colors[i*4 + 2] = color.b;
mesh.colors[i*4 + 3] = color.a;
}
// Upload mesh data from CPU (RAM) to GPU (VRAM) memory
UploadMesh(&mesh, false);
return mesh;
}