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@ -130,6 +130,43 @@ void tag_vertices |
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} |
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} |
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} |
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} |
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/**
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* Calculates the total area of UV coordinates. |
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* |
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* @param vertex_data Vertex buffer data. |
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* @param uv_attribute Vertex UV attribute. |
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* |
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* @return Total UV area. |
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*/ |
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float calculate_uv_area |
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( |
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std::span<std::byte> vertex_data, |
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const gl::vertex_attribute& uv_attribute |
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) |
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{ |
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std::byte* uv_data = vertex_data.data() + uv_attribute.offset; |
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float sum_area = 0.0f; |
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for (std::size_t i = 0; i + 2 < vertex_data.size(); i += 3) |
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{ |
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const float* uv_data_a = reinterpret_cast<const float*>(uv_data + uv_attribute.stride * i); |
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const float* uv_data_b = reinterpret_cast<const float*>(uv_data + uv_attribute.stride * (i + 1)); |
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const float* uv_data_c = reinterpret_cast<const float*>(uv_data + uv_attribute.stride * (i + 2)); |
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const float3 uva = {uv_data_a[0], uv_data_a[1], 0.0f}; |
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const float3 uvb = {uv_data_b[0], uv_data_b[1], 0.0f}; |
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const float3 uvc = {uv_data_c[0], uv_data_c[1], 0.0f}; |
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const float3 uvab = uvb - uva; |
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const float3 uvac = uvc - uva; |
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sum_area += math::length(math::cross(uvab, uvac)) * 0.5f; |
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} |
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return sum_area; |
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} |
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/**
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/**
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* Calculates the bounds of vertex data. |
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* Calculates the bounds of vertex data. |
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* |
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* |
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@ -166,28 +203,54 @@ void tag_vertices |
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return bounds; |
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return bounds; |
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} |
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} |
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/**
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* Calculates a scale factor which will give ant eyes the desired number of ommatidia. |
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* |
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* @param eye_uv_area Total UV area of a single eye. |
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* @param ommatidia_count Desired number of ommatidia. |
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* |
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* @return Ommatidia scale factor. |
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*/ |
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[[nodiscard]] float calculate_ommatidia_scale(float eye_uv_area, float ommatidia_count) |
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{ |
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// Side length of hexagon tiles generated by the eye shader
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constexpr float source_side_length = 1.0f / math::sqrt_3<float>; |
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// Side length of hexagon tiles that will fill UV area
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const float target_side_length = std::sqrt((eye_uv_area * 2.0f) / (3.0f * math::sqrt_3<float> * ommatidia_count)); |
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return source_side_length / target_side_length; |
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} |
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/**
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/**
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* Generates an ant exoskeleton material. |
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* Generates an ant exoskeleton material. |
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* |
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* |
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* @param pigmentation Ant pigmentation phene. |
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* @param sculpturing Ant sculpturing phene. |
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* @param phenome Ant phenome. |
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* @param eye_uv_area Total UV area of a single eye. |
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* |
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* |
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* @return Generated ant exoskeleton material. |
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* @return Generated ant exoskeleton material. |
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*/ |
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*/ |
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[[nodiscard]] std::unique_ptr<render::material> generate_ant_exoskeleton_material |
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[[nodiscard]] std::unique_ptr<render::material> generate_ant_exoskeleton_material |
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( |
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( |
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const ant_pigmentation_phene& pigmentation, |
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const ant_sculpturing_phene& sculpturing |
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const ant_phenome& phenome, |
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float eye_uv_area |
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) |
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) |
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{ |
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{ |
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// Allocate copy of pigmentation material
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// Allocate copy of pigmentation material
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std::unique_ptr<render::material> exoskeleton_material = std::make_unique<render::material>(*pigmentation.material); |
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std::unique_ptr<render::material> exoskeleton_material = std::make_unique<render::material>(*phenome.pigmentation->material); |
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// Set roughness variable
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// Set roughness variable
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exoskeleton_material->set_variable("roughness", std::make_shared<render::material_float>(1, sculpturing.roughness)); |
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exoskeleton_material->set_variable("exoskeleton_roughness", std::make_shared<render::material_float>(1, phenome.sculpturing->roughness)); |
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// Set normal map variable
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// Set normal map variable
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exoskeleton_material->set_variable("normal_map", std::make_shared<render::material_texture_2d>(1, sculpturing.normal_map)); |
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exoskeleton_material->set_variable("exoskeleton_normal_map", std::make_shared<render::material_texture_2d>(1, phenome.sculpturing->normal_map)); |
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if (phenome.eyes->present) |
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{ |
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// Set ommatidia scale variable
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const float ommatidia_scale = calculate_ommatidia_scale(eye_uv_area, static_cast<float>(phenome.eyes->ommatidia_count)); |
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exoskeleton_material->set_variable("ommatidia_scale", std::make_shared<render::material_float>(1, ommatidia_scale)); |
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} |
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return exoskeleton_material; |
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return exoskeleton_material; |
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} |
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} |
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@ -196,9 +259,6 @@ void tag_vertices |
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std::unique_ptr<render::model> ant_morphogenesis(const ant_phenome& phenome) |
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std::unique_ptr<render::model> ant_morphogenesis(const ant_phenome& phenome) |
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{ |
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{ |
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// Generate exoskeleton material
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std::shared_ptr<render::material> exoskeleton_material = generate_ant_exoskeleton_material(*phenome.pigmentation, *phenome.sculpturing); |
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// Get body part models
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// Get body part models
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const render::model* mesosoma_model = phenome.mesosoma->model.get(); |
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const render::model* mesosoma_model = phenome.mesosoma->model.get(); |
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const render::model* legs_model = phenome.legs->model.get(); |
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const render::model* legs_model = phenome.legs->model.get(); |
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@ -378,6 +438,7 @@ std::unique_ptr ant_morphogenesis(const ant_phenome& phenome) |
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// Get vertex attributes
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// Get vertex attributes
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const gl::vertex_attribute* position_attribute = nullptr; |
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const gl::vertex_attribute* position_attribute = nullptr; |
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const gl::vertex_attribute* uv_attribute = nullptr; |
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const gl::vertex_attribute* normal_attribute = nullptr; |
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const gl::vertex_attribute* normal_attribute = nullptr; |
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const gl::vertex_attribute* tangent_attribute = nullptr; |
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const gl::vertex_attribute* tangent_attribute = nullptr; |
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const gl::vertex_attribute* bone_index_attribute = nullptr; |
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const gl::vertex_attribute* bone_index_attribute = nullptr; |
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@ -386,6 +447,10 @@ std::unique_ptr ant_morphogenesis(const ant_phenome& phenome) |
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{ |
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{ |
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position_attribute = &it->second; |
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position_attribute = &it->second; |
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} |
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} |
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if (auto it = vertex_attribute_map.find(render::vertex_attribute::uv); it != vertex_attribute_map.end()) |
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{ |
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uv_attribute = &it->second; |
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} |
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if (auto it = vertex_attribute_map.find(render::vertex_attribute::normal); it != vertex_attribute_map.end()) |
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if (auto it = vertex_attribute_map.find(render::vertex_attribute::normal); it != vertex_attribute_map.end()) |
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{ |
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{ |
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normal_attribute = &it->second; |
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normal_attribute = &it->second; |
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@ -715,6 +780,16 @@ std::unique_ptr ant_morphogenesis(const ant_phenome& phenome) |
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// Allocate model groups
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// Allocate model groups
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model->get_groups().resize(1); |
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model->get_groups().resize(1); |
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// Calculate UV area of a single eye
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float eye_uv_area = 0.0f; |
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if (phenome.eyes->present) |
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{ |
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eye_uv_area = calculate_uv_area({vertex_buffer_data.data() + eyes_vbo_offset, vertex_buffer_data.data() + eyes_vbo_offset + eyes_vertex_count / 2}, *uv_attribute); |
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} |
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// Generate exoskeleton material
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std::shared_ptr<render::material> exoskeleton_material = generate_ant_exoskeleton_material(phenome, eye_uv_area); |
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// Construct model group
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// Construct model group
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render::model_group& model_group = model->get_groups()[0]; |
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render::model_group& model_group = model->get_groups()[0]; |
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model_group.id = "exoskeleton"; |
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model_group.id = "exoskeleton"; |
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