diff --git a/zenovis/src/bate/FrameBufferPicker.cpp b/zenovis/src/bate/FrameBufferPicker.cpp
index 5bdd801bdd..c414589810 100644
--- a/zenovis/src/bate/FrameBufferPicker.cpp
+++ b/zenovis/src/bate/FrameBufferPicker.cpp
@@ -362,9 +362,25 @@ struct FrameBufferPicker : IPicker {
                     empty_and_offset_shader->set_uniform("offset", -0.00001f);
                     scene->camera->set_program_uniforms(empty_and_offset_shader);
 
-                    auto tri_count = prim->tris.size();
-                    ebo->bind_data(prim->tris.data(), tri_count * sizeof(prim->tris[0]));
-                    CHECK_GL(glDrawElements(GL_TRIANGLES, tri_count * 3, GL_UNSIGNED_INT, 0));
+                    // draw prim
+                    if (prim->tris.size()) {
+                        ebo->bind_data(prim->tris.data(), prim->tris.size() * sizeof(prim->tris[0]));
+                        CHECK_GL(glDrawElements(GL_TRIANGLES, prim->tris.size() * 3, GL_UNSIGNED_INT, 0));
+                    }
+                    else if (prim->polys.size()) {
+                        std::vector<vec3i> tris;
+                        for (auto [start, len]: prim->polys) {
+                            for (auto i = 2; i < len; i++) {
+                                tris.emplace_back(
+                                        prim->loops[start],
+                                        prim->loops[start + i - 1],
+                                        prim->loops[start + i]
+                                );
+                            }
+                        }
+                        ebo->bind_data(tris.data(), tris.size() * sizeof(tris[0]));
+                        CHECK_GL(glDrawElements(GL_TRIANGLES, tris.size() * 3, GL_UNSIGNED_INT, 0));
+                    }
                     ebo->unbind();
 
                     // ----- disable depth test -----
@@ -414,9 +430,25 @@ struct FrameBufferPicker : IPicker {
                     // ----- draw object to cover invisible lines -----
                     empty_shader->use();
                     scene->camera->set_program_uniforms(empty_shader);
-                    auto tri_count = prim->tris.size();
-                    ebo->bind_data(prim->tris.data(), tri_count * sizeof(prim->tris[0]));
-                    CHECK_GL(glDrawElements(GL_TRIANGLES, tri_count * 3, GL_UNSIGNED_INT, 0));
+                    // draw prim
+                    if (prim->tris.size()) {
+                        ebo->bind_data(prim->tris.data(), prim->tris.size() * sizeof(prim->tris[0]));
+                        CHECK_GL(glDrawElements(GL_TRIANGLES, prim->tris.size() * 3, GL_UNSIGNED_INT, 0));
+                    }
+                    else if (prim->polys.size()) {
+                        std::vector<vec3i> tris;
+                        for (auto [start, len]: prim->polys) {
+                            for (auto i = 2; i < len; i++) {
+                                tris.emplace_back(
+                                        prim->loops[start],
+                                        prim->loops[start + i - 1],
+                                        prim->loops[start + i]
+                                );
+                            }
+                        }
+                        ebo->bind_data(tris.data(), tris.size() * sizeof(tris[0]));
+                        CHECK_GL(glDrawElements(GL_TRIANGLES, tris.size() * 3, GL_UNSIGNED_INT, 0));
+                    }
                     ebo->unbind();
                     // ----- disable depth test -----
                     CHECK_GL(glDisable(GL_DEPTH_TEST));
@@ -433,9 +465,25 @@ struct FrameBufferPicker : IPicker {
                     prim_shader->use();
                     scene->camera->set_program_uniforms(prim_shader);
                     CHECK_GL(glUniform1ui(glGetUniformLocation(prim_shader->pro, "gObjectIndex"), id + 1));
-                    auto tri_count = prim->tris.size();
-                    ebo->bind_data(prim->tris.data(), tri_count * sizeof(prim->tris[0]));
-                    CHECK_GL(glDrawElements(GL_TRIANGLES, tri_count * 3, GL_UNSIGNED_INT, 0));
+                    // draw prim
+                    if (prim->tris.size()) {
+                        ebo->bind_data(prim->tris.data(), prim->tris.size() * sizeof(prim->tris[0]));
+                        CHECK_GL(glDrawElements(GL_TRIANGLES, prim->tris.size() * 3, GL_UNSIGNED_INT, 0));
+                    }
+                    else if (prim->polys.size()) {
+                        std::vector<vec3i> tris;
+                        for (auto [start, len]: prim->polys) {
+                            for (auto i = 2; i < len; i++) {
+                                tris.emplace_back(
+                                        prim->loops[start],
+                                        prim->loops[start + i - 1],
+                                        prim->loops[start + i]
+                                );
+                            }
+                        }
+                        ebo->bind_data(tris.data(), tris.size() * sizeof(tris[0]));
+                        CHECK_GL(glDrawElements(GL_TRIANGLES, tris.size() * 3, GL_UNSIGNED_INT, 0));
+                    }
                     ebo->unbind();
                     // ----- disable depth test -----
                     CHECK_GL(glDisable(GL_DEPTH_TEST));