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/apps/tools/twndel: plane intersection based point move

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veclavtalica
2025-03-09 00:30:20 +03:00
parent ce2c2513aa
commit 75737b738f
1 changed files with 50 additions and 20 deletions
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70
apps/tools/twndel/tool.c
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@@ -222,6 +222,23 @@ static bool find_closest_point(uint8_t* object_result, uint16_t *point_result) {
} }
/* o = vector origin */
/* v = vector direction, normalized */
/* p = any point on plane */
/* n = normal of a plane */
static bool vector_plane_intersection(Vec3 o, Vec3 v, Vec3 p, Vec3 n, Vec3 *out) {
float dot = vec3_dot(n, v);
if (dot > FLT_EPSILON) {
Vec3 w = vec3_sub(o, p);
float fac = -vec3_dot(n, w) / dot;
*out = vec3_add(o, vec3_scale(v, fac));
return true;
}
/* vector and plane are perpendicular, assume that it lies exactly on it */
return false;
}
static void process_operation_move_point(Operation *op) { static void process_operation_move_point(Operation *op) {
/* finish dragging around */ /* finish dragging around */
/* TODO: dont keep empty ops on stack? */ /* TODO: dont keep empty ops on stack? */
@@ -238,33 +255,46 @@ static void process_operation_move_point(Operation *op) {
(Color){255,255,255,255}, (Color){255,255,255,255},
false); false);
DrawCameraUnprojectResult pos_and_ray = unproject_point(ctx.mouse_position); DrawCameraUnprojectResult cam = unproject_point(ctx.mouse_position);
Vec3 p = point_to_vec3(op->data.move_point.object, op->data.move_point.point); Vec3 p = point_to_vec3(op->data.move_point.object, op->data.move_point.point);
Vec3 d = vec3_sub(pos_and_ray.position, p); bool point_moved = false;
Vec3 b = vec3_cross(d, pos_and_ray.direction);
/* TODO: show thresholds */ /* TODO: show thresholds */
/* TODO: planes used should depend on looking angle */
/* for example, editing from the side makes better use of x/z facing planes */
log_vec3(b, "cross"); Vec3 s;
if (!state.axis_mask[0]) {
if (vector_plane_intersection(cam.position, cam.direction, p, (Vec3){0,copysignf(1,cam.direction.y),0}, &s)) {
int16_t xch = (int16_t)(floorf(vec3_dot(vec3_sub(s, p), (Vec3){1,0,0}) * (float)POINTS_PER_METER));
xch -= xch % state.grid_snap_granularity;
state.points[op->data.move_point.point].x += xch;
op->data.move_point.delta_x += xch;
if (xch != 0) point_moved = true;
}
}
/* change along axes, delta is accumulated when threshold is met*/ if (!state.axis_mask[1]) {
int16_t xch = (int16_t)(floorf(vec3_dot(b, (Vec3){0,0,1}) * (float)POINTS_PER_METER)) * !state.axis_mask[0]; if (vector_plane_intersection(cam.position, cam.direction, p, (Vec3){0,0,copysignf(1,cam.direction.z)}, &s)) {
xch -= xch % state.grid_snap_granularity; int16_t ych = (int16_t)(floorf(vec3_dot(vec3_sub(s, p), (Vec3){0,1,0}) * (float)POINTS_PER_METER));
state.points[op->data.move_point.point].x += xch; ych -= ych % state.grid_snap_granularity;
op->data.move_point.delta_x += xch; state.points[op->data.move_point.point].y += ych;
op->data.move_point.delta_y += ych;
if (ych != 0) point_moved = true;
}
}
int16_t ych = (int16_t)(floorf(vec3_dot(vec3_cross(b, pos_and_ray.direction), (Vec3){0,-1,0}) * (float)POINTS_PER_METER)) * !state.axis_mask[1]; if (!state.axis_mask[2]) {
ych -= ych % state.grid_snap_granularity; if (vector_plane_intersection(cam.position, cam.direction, p, (Vec3){0,copysignf(1,cam.direction.y),0}, &s)) {
state.points[op->data.move_point.point].y += ych; int16_t zch = (int16_t)(floorf(vec3_dot(vec3_sub(s, p), (Vec3){0,0,1}) * (float)POINTS_PER_METER));
op->data.move_point.delta_y += ych; zch -= zch % state.grid_snap_granularity;
state.points[op->data.move_point.point].z += zch;
op->data.move_point.delta_z += zch;
if (zch != 0) point_moved = true;
}
}
int16_t zch = (int16_t)(floorf(vec3_dot(b, (Vec3){-1,0,0}) * (float)POINTS_PER_METER)) * !state.axis_mask[2]; if (point_moved)
zch -= zch % state.grid_snap_granularity;
state.points[op->data.move_point.point].z += zch;
op->data.move_point.delta_z += zch;
if (xch != 0 || ych != 0 || zch != 0)
audio_play("/data/bong.ogg", NULL, false, 0.12f, 0.0f); audio_play("/data/bong.ogg", NULL, false, 0.12f, 0.0f);
} }