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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BLI_math_vector.h"
#include "BLI_task.hh"
#include "RNA_enum_types.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_function_util.hh"
namespace blender::nodes::node_fn_align_euler_to_vector_cc {
static void fn_node_align_euler_to_vector_declare(NodeDeclarationBuilder &b)
{
b.is_function_node();
b.add_input<decl::Vector>(N_("Rotation")).subtype(PROP_EULER).hide_value();
b.add_input<decl::Float>(N_("Factor"))
.default_value(1.0f)
.min(0.0f)
.max(1.0f)
.subtype(PROP_FACTOR);
b.add_input<decl::Vector>(N_("Vector")).default_value({0.0, 0.0, 1.0});
b.add_output<decl::Vector>(N_("Rotation")).subtype(PROP_EULER);
}
static void fn_node_align_euler_to_vector_layout(uiLayout *layout,
bContext *UNUSED(C),
PointerRNA *ptr)
{
uiItemR(layout, ptr, "axis", UI_ITEM_R_EXPAND, nullptr, ICON_NONE);
uiLayoutSetPropSep(layout, true);
uiLayoutSetPropDecorate(layout, false);
uiItemR(layout, ptr, "pivot_axis", 0, IFACE_("Pivot"), ICON_NONE);
}
static void align_rotations_auto_pivot(IndexMask mask,
const VArray<float3> &input_rotations,
const VArray<float3> &vectors,
const VArray<float> &factors,
const float3 local_main_axis,
const MutableSpan<float3> output_rotations)
{
threading::parallel_for(mask.index_range(), 512, [&](IndexRange mask_range) {
for (const int maski : mask_range) {
const int64_t i = mask[maski];
const float3 vector = vectors[i];
if (is_zero_v3(vector)) {
output_rotations[i] = input_rotations[i];
continue;
}
float old_rotation[3][3];
eul_to_mat3(old_rotation, input_rotations[i]);
float3 old_axis;
mul_v3_m3v3(old_axis, old_rotation, local_main_axis);
const float3 new_axis = math::normalize(vector);
float3 rotation_axis = math::cross_high_precision(old_axis, new_axis);
if (is_zero_v3(rotation_axis)) {
/* The vectors are linearly dependent, so we fall back to another axis. */
rotation_axis = math::cross_high_precision(old_axis, float3(1, 0, 0));
if (is_zero_v3(rotation_axis)) {
/* This is now guaranteed to not be zero. */
rotation_axis = math::cross_high_precision(old_axis, float3(0, 1, 0));
}
}
const float full_angle = angle_normalized_v3v3(old_axis, new_axis);
const float angle = factors[i] * full_angle;
float rotation[3][3];
axis_angle_to_mat3(rotation, rotation_axis, angle);
float new_rotation_matrix[3][3];
mul_m3_m3m3(new_rotation_matrix, rotation, old_rotation);
float3 new_rotation;
mat3_to_eul(new_rotation, new_rotation_matrix);
output_rotations[i] = new_rotation;
}
});
}
static void align_rotations_fixed_pivot(IndexMask mask,
const VArray<float3> &input_rotations,
const VArray<float3> &vectors,
const VArray<float> &factors,
const float3 local_main_axis,
const float3 local_pivot_axis,
const MutableSpan<float3> output_rotations)
{
threading::parallel_for(mask.index_range(), 512, [&](IndexRange mask_range) {
for (const int64_t maski : mask_range) {
const int64_t i = mask[maski];
if (local_main_axis == local_pivot_axis) {
/* Can't compute any meaningful rotation angle in this case. */
output_rotations[i] = input_rotations[i];
continue;
}
const float3 vector = vectors[i];
if (is_zero_v3(vector)) {
output_rotations[i] = input_rotations[i];
continue;
}
float old_rotation[3][3];
eul_to_mat3(old_rotation, input_rotations[i]);
float3 old_axis;
mul_v3_m3v3(old_axis, old_rotation, local_main_axis);
float3 pivot_axis;
mul_v3_m3v3(pivot_axis, old_rotation, local_pivot_axis);
float full_angle = angle_signed_on_axis_v3v3_v3(vector, old_axis, pivot_axis);
if (full_angle > M_PI) {
/* Make sure the point is rotated as little as possible. */
full_angle -= 2.0f * M_PI;
}
const float angle = factors[i] * full_angle;
float rotation[3][3];
axis_angle_to_mat3(rotation, pivot_axis, angle);
float new_rotation_matrix[3][3];
mul_m3_m3m3(new_rotation_matrix, rotation, old_rotation);
float3 new_rotation;
mat3_to_eul(new_rotation, new_rotation_matrix);
output_rotations[i] = new_rotation;
}
});
}
class MF_AlignEulerToVector : public fn::MultiFunction {
private:
int main_axis_mode_;
int pivot_axis_mode_;
public:
MF_AlignEulerToVector(int main_axis_mode, int pivot_axis_mode)
: main_axis_mode_(main_axis_mode), pivot_axis_mode_(pivot_axis_mode)
{
static fn::MFSignature signature = create_signature();
this->set_signature(&signature);
}
static fn::MFSignature create_signature()
{
fn::MFSignatureBuilder signature{"Align Euler to Vector"};
signature.single_input<float3>("Rotation");
signature.single_input<float>("Factor");
signature.single_input<float3>("Vector");
signature.single_output<float3>("Rotation");
return signature.build();
}
void call(IndexMask mask, fn::MFParams params, fn::MFContext UNUSED(context)) const override
{
const VArray<float3> &input_rotations = params.readonly_single_input<float3>(0, "Rotation");
const VArray<float> &factors = params.readonly_single_input<float>(1, "Factor");
const VArray<float3> &vectors = params.readonly_single_input<float3>(2, "Vector");
auto output_rotations = params.uninitialized_single_output<float3>(3, "Rotation");
float3 local_main_axis = {0.0f, 0.0f, 0.0f};
local_main_axis[main_axis_mode_] = 1;
if (pivot_axis_mode_ == FN_NODE_ALIGN_EULER_TO_VECTOR_PIVOT_AXIS_AUTO) {
align_rotations_auto_pivot(
mask, input_rotations, vectors, factors, local_main_axis, output_rotations);
}
else {
float3 local_pivot_axis = {0.0f, 0.0f, 0.0f};
local_pivot_axis[pivot_axis_mode_ - 1] = 1;
align_rotations_fixed_pivot(mask,
input_rotations,
vectors,
factors,
local_main_axis,
local_pivot_axis,
output_rotations);
}
}
};
static void fn_node_align_euler_to_vector_build_multi_function(NodeMultiFunctionBuilder &builder)
{
bNode &node = builder.node();
builder.construct_and_set_matching_fn<MF_AlignEulerToVector>(node.custom1, node.custom2);
}
} // namespace blender::nodes::node_fn_align_euler_to_vector_cc
void register_node_type_fn_align_euler_to_vector()
{
namespace file_ns = blender::nodes::node_fn_align_euler_to_vector_cc;
static bNodeType ntype;
fn_node_type_base(
&ntype, FN_NODE_ALIGN_EULER_TO_VECTOR, "Align Euler to Vector", NODE_CLASS_CONVERTER);
ntype.declare = file_ns::fn_node_align_euler_to_vector_declare;
ntype.draw_buttons = file_ns::fn_node_align_euler_to_vector_layout;
ntype.build_multi_function = file_ns::fn_node_align_euler_to_vector_build_multi_function;
nodeRegisterType(&ntype);
}
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