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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup edcurves
*/
#include "BLI_rand.hh"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "BKE_node.h"
#include "BKE_node_runtime.hh"
#include "ED_curves.h"
#include "ED_node.h"
#include "ED_object.h"
#include "DNA_modifier_types.h"
#include "DNA_node_types.h"
#include "DNA_object_types.h"
namespace blender::ed::curves {
static bool has_surface_deformation_node(const bNodeTree &ntree)
{
LISTBASE_FOREACH (const bNode *, node, &ntree.nodes) {
if (node->type == GEO_NODE_DEFORM_CURVES_ON_SURFACE) {
return true;
}
if (node->type == NODE_GROUP) {
if (node->id != nullptr) {
if (has_surface_deformation_node(*reinterpret_cast<const bNodeTree *>(node->id))) {
return true;
}
}
}
}
return false;
}
static bool has_surface_deformation_node(const Object &curves_ob)
{
LISTBASE_FOREACH (const ModifierData *, md, &curves_ob.modifiers) {
if (md->type != eModifierType_Nodes) {
continue;
}
const NodesModifierData *nmd = reinterpret_cast<const NodesModifierData *>(md);
if (nmd->node_group == nullptr) {
continue;
}
if (has_surface_deformation_node(*nmd->node_group)) {
return true;
}
}
return false;
}
void ensure_surface_deformation_node_exists(bContext &C, Object &curves_ob)
{
if (has_surface_deformation_node(curves_ob)) {
return;
}
Main *bmain = CTX_data_main(&C);
Scene *scene = CTX_data_scene(&C);
ModifierData *md = ED_object_modifier_add(
nullptr, bmain, scene, &curves_ob, "Surface Deform", eModifierType_Nodes);
NodesModifierData &nmd = *reinterpret_cast<NodesModifierData *>(md);
nmd.node_group = ntreeAddTree(bmain, "Surface Deform", "GeometryNodeTree");
bNodeTree *ntree = nmd.node_group;
ntreeAddSocketInterface(ntree, SOCK_IN, "NodeSocketGeometry", "Geometry");
ntreeAddSocketInterface(ntree, SOCK_OUT, "NodeSocketGeometry", "Geometry");
bNode *group_input = nodeAddStaticNode(&C, ntree, NODE_GROUP_INPUT);
bNode *group_output = nodeAddStaticNode(&C, ntree, NODE_GROUP_OUTPUT);
bNode *deform_node = nodeAddStaticNode(&C, ntree, GEO_NODE_DEFORM_CURVES_ON_SURFACE);
ED_node_tree_propagate_change(&C, bmain, nmd.node_group);
nodeAddLink(ntree,
group_input,
static_cast<bNodeSocket *>(group_input->outputs.first),
deform_node,
nodeFindSocket(deform_node, SOCK_IN, "Curves"));
nodeAddLink(ntree,
deform_node,
nodeFindSocket(deform_node, SOCK_OUT, "Curves"),
group_output,
static_cast<bNodeSocket *>(group_output->inputs.first));
group_input->locx = -200;
group_output->locx = 200;
deform_node->locx = 0;
ED_node_tree_propagate_change(&C, bmain, nmd.node_group);
}
bke::CurvesGeometry primitive_random_sphere(const int curves_size, const int points_per_curve)
{
bke::CurvesGeometry curves(points_per_curve * curves_size, curves_size);
MutableSpan<int> offsets = curves.offsets_for_write();
MutableSpan<float3> positions = curves.positions_for_write();
bke::MutableAttributeAccessor attributes = curves.attributes_for_write();
bke::SpanAttributeWriter<float> radius = attributes.lookup_or_add_for_write_only_span<float>(
"radius", ATTR_DOMAIN_POINT);
for (const int i : offsets.index_range()) {
offsets[i] = points_per_curve * i;
}
RandomNumberGenerator rng;
for (const int i : curves.curves_range()) {
const IndexRange points = curves.points_for_curve(i);
MutableSpan<float3> curve_positions = positions.slice(points);
MutableSpan<float> curve_radii = radius.span.slice(points);
const float theta = 2.0f * M_PI * rng.get_float();
const float phi = saacosf(2.0f * rng.get_float() - 1.0f);
float3 no = {std::sin(theta) * std::sin(phi), std::cos(theta) * std::sin(phi), std::cos(phi)};
no = math::normalize(no);
float3 co = no;
for (int key = 0; key < points_per_curve; key++) {
float t = key / (float)(points_per_curve - 1);
curve_positions[key] = co;
curve_radii[key] = 0.02f * (1.0f - t);
float3 offset = float3(rng.get_float(), rng.get_float(), rng.get_float()) * 2.0f - 1.0f;
co += (offset + no) / points_per_curve;
}
}
radius.finish();
return curves;
}
} // namespace blender::ed::curves
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