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Move triangleAABB back to its original location

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codemob-dev 2025-07-29 12:04:42 -04:00
parent 22b66021de
commit 2c42f9e688
2 changed files with 108 additions and 104 deletions
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200
src/game.zig
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@ -77,108 +77,108 @@ pub const collision = struct {
pub fn join(self: AABB, other: AABB) AABB { pub fn join(self: AABB, other: AABB) AABB {
return .{.min = @min(self.min, other.min), .max = @max(self.max, other.max)}; return .{.min = @min(self.min, other.min), .max = @max(self.max, other.max)};
} }
pub fn intersectsTriangle(self: AABB, triangle: [3]Vec3d) bool {
const X = 0;
const Y = 1;
const Z = 2;
const box_center = self.center();
const box_extents = self.extent();
// Translate triangle as conceptually moving AABB to origin
const v0 = triangle[0] - box_center;
const v1 = triangle[1] - box_center;
const v2 = triangle[2] - box_center;
// Compute edge vectors for triangle
const f0 = triangle[1] - triangle[0];
const f1 = triangle[2] - triangle[1];
const f2 = triangle[0] - triangle[2];
// Test axis a00
const a00 = Vec3d{0, -f0[Z], f0[Y]};
if(!test_axis(a00, v0, v1, v2, box_extents[Y]*@abs(f0[Z]) + box_extents[Z]*@abs(f0[Y]))) {
return false;
}
// Test axis a01
const a01 = Vec3d{0, -f1[Z], f1[Y]};
if(!test_axis(a01, v0, v1, v2, box_extents[Y]*@abs(f1[Z]) + box_extents[Z]*@abs(f1[Y]))) {
return false;
}
// Test axis a02
const a02 = Vec3d{0, -f2[Z], f2[Y]};
if(!test_axis(a02, v0, v1, v2, box_extents[Y]*@abs(f2[Z]) + box_extents[Z]*@abs(f2[Y]))) {
return false;
}
// Test axis a10
const a10 = Vec3d{f0[Z], 0, -f0[X]};
if(!test_axis(a10, v0, v1, v2, box_extents[X]*@abs(f0[Z]) + box_extents[Z]*@abs(f0[X]))) {
return false;
}
// Test axis a11
const a11 = Vec3d{f1[Z], 0, -f1[X]};
if(!test_axis(a11, v0, v1, v2, box_extents[X]*@abs(f1[Z]) + box_extents[Z]*@abs(f1[X]))) {
return false;
}
// Test axis a12
const a12 = Vec3d{f2[Z], 0, -f2[X]};
if(!test_axis(a12, v0, v1, v2, box_extents[X]*@abs(f2[Z]) + box_extents[Z]*@abs(f2[X]))) {
return false;
}
// Test axis a20
const a20 = Vec3d{-f0[Y], f0[X], 0};
if(!test_axis(a20, v0, v1, v2, box_extents[X]*@abs(f0[Y]) + box_extents[Y]*@abs(f0[X]))) {
return false;
}
// Test axis a21
const a21 = Vec3d{-f1[Y], f1[X], 0};
if(!test_axis(a21, v0, v1, v2, box_extents[X]*@abs(f1[Y]) + box_extents[Y]*@abs(f1[X]))) {
return false;
}
// Test axis a22
const a22 = Vec3d{-f2[Y], f2[X], 0};
if(!test_axis(a22, v0, v1, v2, box_extents[X]*@abs(f2[Y]) + box_extents[Y]*@abs(f2[X]))) {
return false;
}
// Test the three axes corresponding to the face normals of AABB
if(@max(v0[X], @max(v1[X], v2[X])) < -box_extents[X] or @min(v0[X], @min(v1[X], v2[X])) > box_extents[X]) {
return false;
}
if(@max(v0[Y], @max(v1[Y], v2[Y])) < -box_extents[Y] or @min(v0[Y], @min(v1[Y], v2[Y])) > box_extents[Y]) {
return false;
}
if(@max(v0[Z], @max(v1[Z], v2[Z])) < -box_extents[Z] or @min(v0[Z], @min(v1[Z], v2[Z])) > box_extents[Z]) {
return false;
}
// Test separating axis corresponding to triangle face normal
const plane_normal = vec.cross(f0, f1);
const plane_distance = @abs(vec.dot(plane_normal, v0));
const r = box_extents[X]*@abs(plane_normal[X]) + box_extents[Y]*@abs(plane_normal[Y]) + box_extents[Z]*@abs(plane_normal[Z]);
return plane_distance <= r;
}
fn test_axis(axis: Vec3d, v0: Vec3d, v1: Vec3d, v2: Vec3d, r: f64) bool {
const p0 = vec.dot(v0, axis);
const p1 = vec.dot(v1, axis);
const p2 = vec.dot(v2, axis);
const min_p = @min(p0, @min(p1, p2));
const max_p = @max(p0, @max(p1, p2));
return @max(-max_p, min_p) <= r;
}
}; };
pub fn triangleAABB(aabb: AABB, triangle: [3]Vec3d) bool {
const X = 0;
const Y = 1;
const Z = 2;
const box_center = aabb.center();
const box_extents = aabb.extent();
// Translate triangle as conceptually moving AABB to origin
const v0 = triangle[0] - box_center;
const v1 = triangle[1] - box_center;
const v2 = triangle[2] - box_center;
// Compute edge vectors for triangle
const f0 = triangle[1] - triangle[0];
const f1 = triangle[2] - triangle[1];
const f2 = triangle[0] - triangle[2];
// Test axis a00
const a00 = Vec3d{0, -f0[Z], f0[Y]};
if(!test_axis(a00, v0, v1, v2, box_extents[Y]*@abs(f0[Z]) + box_extents[Z]*@abs(f0[Y]))) {
return false;
}
// Test axis a01
const a01 = Vec3d{0, -f1[Z], f1[Y]};
if(!test_axis(a01, v0, v1, v2, box_extents[Y]*@abs(f1[Z]) + box_extents[Z]*@abs(f1[Y]))) {
return false;
}
// Test axis a02
const a02 = Vec3d{0, -f2[Z], f2[Y]};
if(!test_axis(a02, v0, v1, v2, box_extents[Y]*@abs(f2[Z]) + box_extents[Z]*@abs(f2[Y]))) {
return false;
}
// Test axis a10
const a10 = Vec3d{f0[Z], 0, -f0[X]};
if(!test_axis(a10, v0, v1, v2, box_extents[X]*@abs(f0[Z]) + box_extents[Z]*@abs(f0[X]))) {
return false;
}
// Test axis a11
const a11 = Vec3d{f1[Z], 0, -f1[X]};
if(!test_axis(a11, v0, v1, v2, box_extents[X]*@abs(f1[Z]) + box_extents[Z]*@abs(f1[X]))) {
return false;
}
// Test axis a12
const a12 = Vec3d{f2[Z], 0, -f2[X]};
if(!test_axis(a12, v0, v1, v2, box_extents[X]*@abs(f2[Z]) + box_extents[Z]*@abs(f2[X]))) {
return false;
}
// Test axis a20
const a20 = Vec3d{-f0[Y], f0[X], 0};
if(!test_axis(a20, v0, v1, v2, box_extents[X]*@abs(f0[Y]) + box_extents[Y]*@abs(f0[X]))) {
return false;
}
// Test axis a21
const a21 = Vec3d{-f1[Y], f1[X], 0};
if(!test_axis(a21, v0, v1, v2, box_extents[X]*@abs(f1[Y]) + box_extents[Y]*@abs(f1[X]))) {
return false;
}
// Test axis a22
const a22 = Vec3d{-f2[Y], f2[X], 0};
if(!test_axis(a22, v0, v1, v2, box_extents[X]*@abs(f2[Y]) + box_extents[Y]*@abs(f2[X]))) {
return false;
}
// Test the three axes corresponding to the face normals of AABB
if(@max(v0[X], @max(v1[X], v2[X])) < -box_extents[X] or @min(v0[X], @min(v1[X], v2[X])) > box_extents[X]) {
return false;
}
if(@max(v0[Y], @max(v1[Y], v2[Y])) < -box_extents[Y] or @min(v0[Y], @min(v1[Y], v2[Y])) > box_extents[Y]) {
return false;
}
if(@max(v0[Z], @max(v1[Z], v2[Z])) < -box_extents[Z] or @min(v0[Z], @min(v1[Z], v2[Z])) > box_extents[Z]) {
return false;
}
// Test separating axis corresponding to triangle face normal
const plane_normal = vec.cross(f0, f1);
const plane_distance = @abs(vec.dot(plane_normal, v0));
const r = box_extents[X]*@abs(plane_normal[X]) + box_extents[Y]*@abs(plane_normal[Y]) + box_extents[Z]*@abs(plane_normal[Z]);
return plane_distance <= r;
}
fn test_axis(axis: Vec3d, v0: Vec3d, v1: Vec3d, v2: Vec3d, r: f64) bool {
const p0 = vec.dot(v0, axis);
const p1 = vec.dot(v1, axis);
const p2 = vec.dot(v2, axis);
const min_p = @min(p0, @min(p1, p2));
const max_p = @max(p0, @max(p1, p2));
return @max(-max_p, min_p) <= r;
}
const Direction = enum(u2) {x = 0, y = 1, z = 2}; const Direction = enum(u2) {x = 0, y = 1, z = 2};
pub fn collideWithBlock(block: main.blocks.Block, x: i32, y: i32, z: i32, entityPosition: Vec3d, entityBoundingBoxExtent: Vec3d, directionVector: Vec3d) ?struct {box: AABB, dist: f64} { pub fn collideWithBlock(block: main.blocks.Block, x: i32, y: i32, z: i32, entityPosition: Vec3d, entityBoundingBoxExtent: Vec3d, directionVector: Vec3d) ?struct {box: AABB, dist: f64} {

12
src/models.zig
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@ -204,12 +204,12 @@ pub const Model = struct {
} }
fn generateCollision(self: *Model, modelQuads: []QuadInfo) void { fn generateCollision(self: *Model, modelQuads: []QuadInfo) void {
var grid: [meshGridSize][meshGridSize][meshGridSize]bool = undefined; var hollowGrid: [meshGridSize][meshGridSize][meshGridSize]bool = undefined;
const voxelSize: Vec3f = @splat(1.0/@as(f32, meshGridSize)); const voxelSize: Vec3f = @splat(1.0/@as(f32, meshGridSize));
for(0..meshGridSize) |x| { for(0..meshGridSize) |x| {
for(0..meshGridSize) |y| { for(0..meshGridSize) |y| {
for(0..meshGridSize) |z| { for(0..meshGridSize) |z| {
grid[x][y][z] = false; hollowGrid[x][y][z] = false;
const blockX = @as(f32, @floatFromInt(x))/meshGridSize; const blockX = @as(f32, @floatFromInt(x))/meshGridSize;
const blockY = @as(f32, @floatFromInt(y))/meshGridSize; const blockY = @as(f32, @floatFromInt(y))/meshGridSize;
const blockZ = @as(f32, @floatFromInt(z))/meshGridSize; const blockZ = @as(f32, @floatFromInt(z))/meshGridSize;
@ -228,8 +228,9 @@ pub const Model = struct {
@floatCast(quad.cornerVec(3) - shift), @floatCast(quad.cornerVec(3) - shift),
}; };
if(voxel.intersectsTriangle(triangle1) or voxel.intersectsTriangle(triangle2)) {
grid[x][y][z] = true; if(main.game.collision.triangleAABB(voxel, triangle1) or main.game.collision.triangleAABB(voxel, triangle2)) {
hollowGrid[x][y][z] = true;
break; break;
} }
} }
@ -237,6 +238,9 @@ pub const Model = struct {
} }
} }
var grid: [meshGridSize][meshGridSize][meshGridSize]bool = undefined;
var collision: std.ArrayList(AABB) = .init(main.globalAllocator.allocator); var collision: std.ArrayList(AABB) = .init(main.globalAllocator.allocator);
for(0..meshGridSize) |x| { for(0..meshGridSize) |x| {